# Appendix A - Exercise Set - Page 975: 18

$3/2$

#### Work Step by Step

For this problem, you set the general formula of linear function $Y=aX+b$. Then plug (-2,6) and (0,9) into this formula. You get $6=-2a+b$ and $b=9$. Combine this two together, you get $6=-2a+9$, $a=3/2$

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