What is the value of each digit in this number 58

Using elimination, what is -4x+2y=-12 4x+8y=-24

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

Use a transformation to solve the equation. w/4 = 8 can you also leave a detailed explanation on how this equation = 32