Answer:
y = 5 /2 x + 100
Explanation:
It is easily visible that it goes 125 to the right when it goes 50 up. Those are both divisible by 25 and you get 5 and 2. For every 5 points it goes to the right, it goes 2 points up. After that you simply add the y value at x value 0, which is 100, and you have your answer.