Solve 7x + 2 = −5

The solution of 7x + 2 = −5 is x = -1.

7x + 2 = -5\ \Rightarrow\ x = -1

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The lines y = 7x + 2 and y = -5 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 addition, then the multiplication.
$7x + 2 = -5$
2
Subtract 2 from both sides:
$7x + 2 - 2 = -5 - 2 \ \Rightarrow\ 7x = -7$
3
Divide both sides by 7:
$\frac{7x}{7} = \frac{-7}{7} \ \Rightarrow\ x = -1$
4
Check: put x = -1 back into the equation.
$7\cdot(-1) + 2 = -7 + 2 = -5 \checkmark$

LaTeX source of the formulas on this page

\[ 7x + 2 = -5\ \Rightarrow\ x = -1 \]
\[ 7x + 2 = -5 \]
\[ 7x + 2 - 2 = -5 - 2 \ \Rightarrow\ 7x = -7 \]
\[ \frac{7x}{7} = \frac{-7}{7} \ \Rightarrow\ x = -1 \]
\[ 7\cdot(-1) + 2 = -7 + 2 = -5 \checkmark \]

Trying values of x in 7x + 2 = −5

x	7x + 2	Equals -5?
-3	-19	no
-2	-12	no
-1	-5	yes
0	2	no
1	9	no

Questions

What is x in 7x + 2 = −5?

The solution of 7x + 2 = −5 is x = -1.

How do you solve 7x + 2 = −5?

Subtract 2 from both sides to get 7x = -7, then divide both sides by 7 to get x = -1.

How do I check the answer?

Replace x by -1: 7(-1) + 2 = -5, which is -5.

Solve 7x + 2 = −5

How to work it out

Trying values of x in 7x + 2 = −5

Questions

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