Solve 6x − 9 = −39

The solution of 6x − 9 = −39 is x = -5.

6x - 9 = -39\ \Rightarrow\ x = -5

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The lines y = 6x − 9 and y = -39 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 subtraction, then the multiplication.
$6x - 9 = -39$
2
Add 9 to both sides:
$6x - 9 + 9 = -39 + 9 \ \Rightarrow\ 6x = -30$
3
Divide both sides by 6:
$\frac{6x}{6} = \frac{-30}{6} \ \Rightarrow\ x = -5$
4
Check: put x = -5 back into the equation.
$6\cdot(-5) - 9 = -30 - 9 = -39 \checkmark$

LaTeX source of the formulas on this page

\[ 6x - 9 = -39\ \Rightarrow\ x = -5 \]
\[ 6x - 9 = -39 \]
\[ 6x - 9 + 9 = -39 + 9 \ \Rightarrow\ 6x = -30 \]
\[ \frac{6x}{6} = \frac{-30}{6} \ \Rightarrow\ x = -5 \]
\[ 6\cdot(-5) - 9 = -30 - 9 = -39 \checkmark \]

Trying values of x in 6x − 9 = −39

x	6x − 9	Equals -39?
-7	-51	no
-6	-45	no
-5	-39	yes
-4	-33	no
-3	-27	no

Questions

What is x in 6x − 9 = −39?

The solution of 6x − 9 = −39 is x = -5.

How do you solve 6x − 9 = −39?

Add 9 to 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) − 9 = -39, which is -39.

Solve 6x − 9 = −39

How to work it out

Trying values of x in 6x − 9 = −39

Questions

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