Answer:
70 hours.
Step-by-step explanation:
you need to subtract 450 from 75 which tells you you need 350 more dollars then you need to do 5x70 which gives you 350.
The equation solution is y=1, so the two ordered pairs may contain any value of x and a value of 1 for y. (Ex: (-8,1) and (8,1))
Use the equation to find the missing height, h, by undoing the equation. Use SADMEP, the reverse order of operations.
:)
34 books would be the answer.