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Pearson Algebra 1 Common Core, 2011 View details

4. Factoring to Solve Quadratic Equations

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Exercise 48 Page 572

Substitute 0 for x.

(0,3)

Practice makes perfect

To determine the y-intercept of a line, let's think of the point where the graph of an equation crosses the y-axis. The x-value of the ( x, y) coordinate pair at the y-intercept is 0. Therefore, substituting 0 for x will give us the y-intercept.

3y-4x=9

Substitute

x= 0

3y-4( 0)=9

ZeroPropMult

Zero Property of Multiplication

3y=9

DivEqn

.LHS /3.=.RHS /3.

y=3

A y-intercept of 3 means that the graph passes through the y-axis at the point (0, 3).