Solve 2x − 9 = −13

The solution of 2x − 9 = −13 is x = -2.

2x - 9 = -13\ \Rightarrow\ x = -2

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The lines y = 2x − 9 and y = -13 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 subtraction, then the multiplication.
$2x - 9 = -13$
2
Add 9 to both sides:
$2x - 9 + 9 = -13 + 9 \ \Rightarrow\ 2x = -4$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{-4}{2} \ \Rightarrow\ x = -2$
4
Check: put x = -2 back into the equation.
$2\cdot(-2) - 9 = -4 - 9 = -13 \checkmark$

LaTeX source of the formulas on this page

\[ 2x - 9 = -13\ \Rightarrow\ x = -2 \]
\[ 2x - 9 = -13 \]
\[ 2x - 9 + 9 = -13 + 9 \ \Rightarrow\ 2x = -4 \]
\[ \frac{2x}{2} = \frac{-4}{2} \ \Rightarrow\ x = -2 \]
\[ 2\cdot(-2) - 9 = -4 - 9 = -13 \checkmark \]

Trying values of x in 2x − 9 = −13

x	2x − 9	Equals -13?
-4	-17	no
-3	-15	no
-2	-13	yes
-1	-11	no
0	-9	no

Questions

What is x in 2x − 9 = −13?

The solution of 2x − 9 = −13 is x = -2.

How do you solve 2x − 9 = −13?

Add 9 to both sides to get 2x = -4, then divide both sides by 2 to get x = -2.

How do I check the answer?

Replace x by -2: 2(-2) − 9 = -13, which is -13.

Solve 2x − 9 = −13

How to work it out

Trying values of x in 2x − 9 = −13

Questions

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