In an algebra test, the highest grade was 50 points higher than the lowest grade. The sum of the two

In an algebra test, the highest grade was 50 points higher than the lowest grade. The sum of the two grades was 180.

Let the high grade be h and the low grade be l. We're given:

1. h = l + 50
2. h + l = 180

Substitute equation (1) into equation (2) for h
l + 50 + l = 180

To solve this equation, we type it in our search engine and we get:
l = 65

Now, we take l = 65 and substitute it into equation (1) to solve for h:
h = 65 + 50
h = 115