Idont understand these problems |×| - 1 < 5 , 3x + 4 < -2, 5x/7 -2=1, 9(2x+3)=10

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

What is the answer to the question 5x+2x

Maddie's rectangular kitchen has an area of 10 square yards and a length of 3 3/4 yards. how many yards wide is maddie's kitchen?