The first step to sove the equation -18 is shown below.
Which property was applied in this step?
O Addition Property of Equality
O Subtraction Property of Equality
O Multiplication Property of Equality
O Division Property of Equality

Multiplication Property of Equality

hope this helps

(a)

Step-by-step explanation:

Im pretty sure it's a because in the equation on top it is subtraction and the inverse operation works like the opposite of what the problem is. Since it is subtraction you have to use the addition of equatily. Hope this helps :)

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

true

step-by-step explanation: