# Write an equation to represent the function

Let's look at an example of an algebra word problem. Algebra Word Problems Linda was selling tickets for the school play. She sold 10 more adult tickets than children tickets and she sold twice as many senior tickets as children tickets. Using interval notation, we say that the function is decreasing on the interval -3, 2 increasing on -infinity, -3 and 2, infinity Exercise 3: Answer Some of the most characteristics of a function are its Relative Extreme Values. Points on the functions graph corresponding to relative extreme values are turning points, or points where the function changes from decreasing to increasing or vice versa.

Let f be the function whose graph is drawn below. Note that f a is not the smallest function value, f c is. However, if we consider only the portion of the graph in the circle above a, then f a is the smallest second coordinate. Look at the circle on the graph above b.

While f b is not the largest function value this function does not have a largest valueif we look only at the portion of the graph in the circle, then the point b, f b is above all the other points.

## Related Questions

So, f b is a relative maximum of f. Indeed, f c is the absolute minimum of f, but it is also one of the relative minima. Here again we are giving definitions that appeal to your geometric intuition.

The precise definitions are given in your text. Return to Contents Approximating Relative Extrema Finding the exact location of a function's relative extrema generally requires calculus.

However, graphing utilities such as the Java Grapher may be used to approximate these numbers. Suppose a is a number such that f a is a relative minimum. In applications, it is often more important to know where the function attains its relative minimum than it is to know what the relative minimum is.

We will call the point 2,0 a relative minimum point. In general, a relative extreme point is a point on the graph of f whose second coordinate is a relative extreme value of f. When you display the graph of f in the default viewing rectangle you see that f has one relative maximum point near -1,4 and one relative minimum point near 2, The approximations -1,4 and 2,-8 are not very close to the real relative extreme points, so we will use the zoom and trace features to improve the approximations.

When you click the Trace button, a point on the graph of f is indicated with a small circle. The coordinates of that point are reported in the two text boxes near the Trace button.

If you select a larger Step Size from the pull down menu, then the trace point moves farther with each click. It is possible to move faster with the enter key than with the mouse. Using the default view, the lowest point found while tracing near the minimum point is 1.

Note that this is not the exact location of the minimum point. We need to look at the trace points on either side of this point to get an idea of how close we are.

Find this trace point, make sure that the Step Size is set to 1, and then find the points on either side of this point. The table below lists the coordinates of these points.A(2) Linear functions, equations, and inequalities. The student applies the mathematical process standards when using properties of linear functions to write and represent in multiple ways, with and without technology, linear equations, inequalities, and systems of .

Improve your math knowledge with free questions in "Write an equation from a graph using a table" and thousands of other math skills. The Transformation of the Graph of a Quadratic Equation. We will always write our equations in the form "x-something" and resulting horizontal translation is in the direction of the sign of the something and a number of units equal to its absolute value.

Our function will take on the form: y = (2x)² = 4x². Understanding what we mean. Write on the board these three equations of quadratic functions: Standard Form: 1. y = x2 – 10x + 24 Factored Form: 2. y = (x – 4)(x – 6) Completed Square Form: 3. y = (x – 5)2 – 1 Here are the equations of three quadratic functions. Without performing any algebraic manipulations, write the coordinates of a key feature of each of their graphs. For each equation, select a different key feature.

In the function \(y = 3x - 2\), the variable y represents the function of whatever inputs appear on the other side of the equation.

Writing an Absolute Value Function Write an equation of the graph shown. SOLUTION The vertex of the graph is (0, º3), so the equation has the form: y =a|x º 0|+(º3) or y = a|x| º 3 To find the value of a, substitute the coordinates of the point (2,1) into the equation and solve. y = a|x| º 3 Write equation. 1 = a|2| º 3 Substitute 1 for y and 2 for x. b) To find the maximum concentration, let’s put the equation in the graphing calculator and use the maximum function to find both the \(x\) and \(y\) values. You can see that the maximum concentration of mg occurs after 1 hour. A function is an equation that has only one answer for y for every x. A function assigns exactly one output to each input of a specified type. It is common to name a function either f(x) or g(x) instead of y. f(2) means that we should find the value of our function when x equals 2. HOW TO GRAPH FUNCTIONS AND LINEAR EQUATIONS.

In other words, y is a function of x. Because of that, we sometimes see the function written in this form. How To: Given a graph of linear function, find the equation to describe the function. Identify the y-intercept of an equation.

Choose two points to determine the slope. Substitute the y-intercept and slope into the slope-intercept form of a line.

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