My friend needs help

X = 7

Step-by-step explanation:

7

Step-by-step explanation:

3x/2-10 =1/2

divide 3x/2 = 1 1/2x

1 1/2x-10=1/2

      +10   +10

1 1/2x =10 1/2

1 1/2x divided by 1 1/2x = x

10.5 divided by 1 1/2=7

x=7

Hope this helps your friend :)

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