Solve the system of equations by the substitution method.
7x - y = 70
4x + 3y = 15

+2

(1) Answers

johncmoore02

first, multiply the above equation for -3. We get -21x + 3y = -210
substitute both equation for each other.
later we got -25x = -225
x = 9
replace x = 9 for 7x - y = 70
y = 7*9-70
y=-7