Equation for linear function.
y=mx+b
We need 2 sets of numbers from the graph to find the slope. Do rise/run or y/x.
(50-28)/(5-4)=22/1=22
so m=22
y=22x+b
Now substitute x and y in to solve for b
28=4*22+b
-60=b
Now we have the equation all ready.
y=22x-60 Done!
If you have any questions just ask in the comment I will get to it as soon as I could.
*Also although I don't really care about points the points I recieve is half the amount you choose to put in so I got 5 points. Although I honestly don't answer questions for points anyway :)
