Question

Solve: -3x + 12 = -18

Answer 1

Answer:

x=2

Step-by-step explanation:

-3x+12=-18

-3x=-18+12

-3x=-6

x=-6/-3

x=2

Answer 2

Answer:

x=10

Step-by-step explanation:

We are given the equation:

$-3x+12= -18$

and asked to solve for x. Therefore, we must isolate x on one side of the equation.

12 is being added to -3x. The inverse of addition is subtraction. Subtract 12 from both sides of the equation.

$-3x+12-12= -18 -12$

$-3x= -18-12$

$-3x=-30$

x is being multiplied by -3. The inverse of multiplication is division. Divide both sides of the equation by -3.

$-3x/3=-30/-3$

$x= -30/-3$

$x=10$

Let's check our solution. Plug 10 in for x and solve.

$-3x+12=-18$

$-3(10)+12=-18$

Multiply -3 and 10.

$-30+12=-18$

Add 12 to -30.

$-18=-18$

This checks out, so we know our solution is correct.

The solution -3x+12=-18 is x=10.