What property is 8x = −13

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Solve the system of equations. y= 2x y= x^2 - 15

Melissa is purchasing a $160,000 home and her bank is offering her a 30-year mortgage at a 4.9% interest rate. in order to lower her monthly payment, melissa will make a 20% down payment and will purchase 3 points. what will her monthly mortgage payment be? a. $645.98 b. $650.46 c. $662.93 d. $606.69