Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 5 - Linear Functions - 5-3 Slope-Intercept Form - Practice and Problem-Solving Exercises - Page 310: 32



Work Step by Step

Slope-intercept form is written as y=mx+b. m=$\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$, and it's given that $x_{1}$=-7, $x_{2}$=-12, $y_{1}$=-3, $y_{2}$=5, we can solve for m by plugging in the givens into the slope equation. Therefore, m=$\frac{5-(-3)}{-12-(-7)}$=$\frac{8}{-5}$=-$\frac{8}{5}$. Now we know that y=(-$\frac{8}{5}$)x+b=-$\frac{8}{5}$x+b, and we can solve for b by plugging in one of the two points, in this case we'll plug in the point (-12,5) 5=(-$\frac{8}{5}$)(-12)+b, so 5=$\frac{96}{5}$+b, and after we subtract $\frac{96}{5}$ from both sides, b=-$\frac{71}{5}$ Therefore, y=-$\frac{8}{5}$x-$\frac{71}{5}$
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