f(x)=ax+b, if f(1)=12 and f(2)=17 then what is f(17)?

Answer 1

y=ax+b, (1,12), (2,17) go right 1, up 5, slope = 5

12 =a + b

17 =2a +b

subtract

5 = a

b =7

y= 5x -+ 7

f(17) = 5(17) + 7= 85+7 = 92

f(17) = 92