Answer:
y = 50x + 75
Step-by-step explanation:
equation formula is y = mx + b
Let's set "coordinates" to make this easier. (2, 175) and (7, 425)
m = slope
slope = change in y/change in x = (425 - 175) / (7 - 2) = 250 / 5 = 50
So equations is now y = 50x + b
To get b, substitute one of the coordinates.
175 = 50(2) + b
175 = 100 + b
75 = b
So equation is y = 50x + 75