Question

What is the value of y so that the ordered pair (5, y) is a solution to the equation –5x + y = –40?
A.
–65

B.
9

C.
–15

D.
7

Answer 1

$-5x + y = -40\\\\x=5\\\\-5(5)+y=-40\\-25+y=-40\\y-25 = -40\\y -25+ 25 = -40+25\\y = -40+25\\\\\boxed{\bf{y=-15}}$

Answer is C.