Tech squad
$20 service charge
plus $65 an hour
1. at how many hours of service do the
repair services cost the same?
write an equation you could solve to find
out.
70+45h =

answer: d. $20

step-by-step explanation:

just took the test

the monthly balance will be $75,000

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18