Math
posted by Audrey on .
how do I write a rule for this function?
x: 4, 0, 2, 4
f(x): 4, 6, 7, 8

slope = (84)/(44) = 4/8 = 1/2
It is constant for all points
so
y = .5 x + b
8 = .5(4) + b
6 = b
so
y = .5 x + 6
check that for all points like (4,4)
4 = (.5)(4) + 6 ???
4 = 2 + 6
4 = 4 sure enough