Solve 3x + 4 = −2

The solution of 3x + 4 = −2 is x = -2.

3x + 4 = -2\ \Rightarrow\ x = -2

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The lines y = 3x + 4 and y = -2 meet at x = -2. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

1
The goal is to get x alone. Undo the operations in the opposite order: first the addition, then the multiplication.
$3x + 4 = -2$
2
Subtract 4 from both sides:
$3x + 4 - 4 = -2 - 4 \ \Rightarrow\ 3x = -6$
3
Divide both sides by 3:
$\frac{3x}{3} = \frac{-6}{3} \ \Rightarrow\ x = -2$
4
Check: put x = -2 back into the equation.
$3\cdot(-2) + 4 = -6 + 4 = -2 \checkmark$

LaTeX source of the formulas on this page

\[ 3x + 4 = -2\ \Rightarrow\ x = -2 \]
\[ 3x + 4 = -2 \]
\[ 3x + 4 - 4 = -2 - 4 \ \Rightarrow\ 3x = -6 \]
\[ \frac{3x}{3} = \frac{-6}{3} \ \Rightarrow\ x = -2 \]
\[ 3\cdot(-2) + 4 = -6 + 4 = -2 \checkmark \]

Trying values of x in 3x + 4 = −2

x	3x + 4	Equals -2?
-4	-8	no
-3	-5	no
-2	-2	yes
-1	1	no
0	4	no

Questions

What is x in 3x + 4 = −2?

The solution of 3x + 4 = −2 is x = -2.

How do you solve 3x + 4 = −2?

Subtract 4 from both sides to get 3x = -6, then divide both sides by 3 to get x = -2.

How do I check the answer?

Replace x by -2: 3(-2) + 4 = -2, which is -2.

Solve 3x + 4 = −2

How to work it out

Trying values of x in 3x + 4 = −2

Questions

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