Write a linear function g wth g(0)-9 and g(x)=7.

(0,9) and (8,7) have a line through them with slope (9-7)/(0-8) =-2/8 = =1/4

y=-(1/4)x + b

9 = 0 + b

b =9

y = -(1/4)x + 9

g(x) = -x/4 + 9

whatever you can spend with $11.53 or under.

step-by-step explanation:

20 - 8.47 = 11.53. take away the money he used for lunch from the starting amount of 20.