2x+3= -15 what is x step by step

x = -9

Step-by-step explanation: To solve for x, we first isolate

the term containing x which in this case is 2x.

Since 3 is being added to 2x,

we subtract 3 from both sides of the equation.

On the left, the +3 and -3 cancel out

and on the right, -15 - 3 is -18.

So we have 2x = -18.

Now we can finish things off by dividing

both sides of the equation by 2.

On the left, the 2's cancel and on

the right, -18 divided by 2 is -9.

So we have x = -9 which is the solution to this equation.

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

42

step-by-step explanation: