If sarah went to the shop and there was a 10% sale. she was going to buy 7 CDs for $60

10 % of 60$ => 10/100 × 60$ => 6$

6$ for 7 cds => 42 $

because 1.2 isnt half of 6 duh

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