Question 107266
a linear graph has the form y=mx+b
f(2)=-3 means that when x=2, y=-3

so wehave -3=2m+b

f(-2)=5 means that when x=-2, y=5

so we have 5=-2m+b

we solve these simulateously
 *[invoke linear_substitution "m", "b", 2, 1, -3, -2, 1, 5]