He still has 75% of his income left because 1500/375=4 so he spent 1/4 of his check and has 3/4 left.
Answer:
Part a) The equation is 
Part b) 
Step-by-step explanation:
Let
p -----> the number of paintings
we know that
Break even is when sales are equal to cost.
The linear equation that represent this problem is

Solve for p
Subtract p both sides


Divide by 7 both sides


Rewrite

Check the solution

substitute the value of p

----> is ok
It’s the same thing as 5+5+5+5+5+5+5=35