Answer:
Below
Explanation:
f(1) - 2 = a(1) + b
- 2 = a + b (1)
f(5) 10 = a (5) + b
10 = 5a + b (2)
Multiply first underlined equation by -5 to get
10 = -5a - 5b add this to the second equation (this will eliminate 'a')
20 = - 4 b so b = -5
then the first equation becomes - 2 = a + (-5)
which shows a = 3
so your function is just f(x) = 3x -5