McGraw Hill Integrated II, 2012
MH
McGraw Hill Integrated II, 2012 View details
1. Graphing Quadratic Functions
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Exercise 90 Page 103

You will need to substitute 0 for y and solve.

10

Practice makes perfect

Think of the point where the graph of an equation crosses the x-axis. The y-value of that ( x, y) coordinate pair is 0, and the x-value is the x-intercept. To find the x-intercept of the equation, we should substitute 0 for y and solve for x.

x+2y=10
x+2( 0)=10
x=10

An x-intercept of 10 means that the graph passes through the x-axis at the point ( 10,0).