Question 254864
There is something wrong because y doesn't change in the last three.
that can't be a linear equation since y does change in the first three.
I think the last three y's should be 50 60 70.

10/5=slope
(y-y1)=m(x-x1)
(y-20)=m(x-5)

y-20=2x-10
y=2x+10