Answer is y = 45x
Step by step
Each pair of coordinates show a slope of 45. Here are the first two.
(1, 45) (2, 90)
y2-y1 over x2 - x1 is the formula for slope
90-45 over 2-1
45/1 slope
You can also see rise (y) over run (x) is 45/1
The point the line crosses the y axis is 0 so there is no y intercept