Solve 2x − 9 = −7

The solution of 2x − 9 = −7 is x = 1.

2x - 9 = -7\ \Rightarrow\ x = 1

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The lines y = 2x − 9 and y = -7 meet at x = 1. 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.
$2x - 9 = -7$
2
Add 9 to both sides:
$2x - 9 + 9 = -7 + 9 \ \Rightarrow\ 2x = 2$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{2}{2} \ \Rightarrow\ x = 1$
4
Check: put x = 1 back into the equation.
$2\cdot1 - 9 = 2 - 9 = -7 \checkmark$

LaTeX source of the formulas on this page

\[ 2x - 9 = -7\ \Rightarrow\ x = 1 \]
\[ 2x - 9 = -7 \]
\[ 2x - 9 + 9 = -7 + 9 \ \Rightarrow\ 2x = 2 \]
\[ \frac{2x}{2} = \frac{2}{2} \ \Rightarrow\ x = 1 \]
\[ 2\cdot1 - 9 = 2 - 9 = -7 \checkmark \]

Trying values of x in 2x − 9 = −7

x	2x − 9	Equals -7?
-1	-11	no
0	-9	no
1	-7	yes
2	-5	no
3	-3	no

Questions

What is x in 2x − 9 = −7?

The solution of 2x − 9 = −7 is x = 1.

How do you solve 2x − 9 = −7?

Add 9 to both sides to get 2x = 2, then divide both sides by 2 to get x = 1.

How do I check the answer?

Replace x by 1: 2(1) − 9 = -7, which is -7.

Solve 2x − 9 = −7

How to work it out

Trying values of x in 2x − 9 = −7

Questions

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