Solve 6x + 15 = −15

The solution of 6x + 15 = −15 is x = -5.

6x + 15 = -15\ \Rightarrow\ x = -5

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The lines y = 6x + 15 and y = -15 meet at x = -5. 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.
$6x + 15 = -15$
2
Subtract 15 from both sides:
$6x + 15 - 15 = -15 - 15 \ \Rightarrow\ 6x = -30$
3
Divide both sides by 6:
$\frac{6x}{6} = \frac{-30}{6} \ \Rightarrow\ x = -5$
4
Check: put x = -5 back into the equation.
$6\cdot(-5) + 15 = -30 + 15 = -15 \checkmark$

LaTeX source of the formulas on this page

\[ 6x + 15 = -15\ \Rightarrow\ x = -5 \]
\[ 6x + 15 = -15 \]
\[ 6x + 15 - 15 = -15 - 15 \ \Rightarrow\ 6x = -30 \]
\[ \frac{6x}{6} = \frac{-30}{6} \ \Rightarrow\ x = -5 \]
\[ 6\cdot(-5) + 15 = -30 + 15 = -15 \checkmark \]

Trying values of x in 6x + 15 = −15

x	6x + 15	Equals -15?
-7	-27	no
-6	-21	no
-5	-15	yes
-4	-9	no
-3	-3	no

Questions

What is x in 6x + 15 = −15?

The solution of 6x + 15 = −15 is x = -5.

How do you solve 6x + 15 = −15?

Subtract 15 from both sides to get 6x = -30, then divide both sides by 6 to get x = -5.

How do I check the answer?

Replace x by -5: 6(-5) + 15 = -15, which is -15.

Solve 6x + 15 = −15

How to work it out

Trying values of x in 6x + 15 = −15

Questions

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