Solve 7x + 2 = −47

The solution of 7x + 2 = −47 is x = -7.

7x + 2 = -47\ \Rightarrow\ x = -7

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The lines y = 7x + 2 and y = -47 meet at x = -7. 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.
$7x + 2 = -47$
2
Subtract 2 from both sides:
$7x + 2 - 2 = -47 - 2 \ \Rightarrow\ 7x = -49$
3
Divide both sides by 7:
$\frac{7x}{7} = \frac{-49}{7} \ \Rightarrow\ x = -7$
4
Check: put x = -7 back into the equation.
$7\cdot(-7) + 2 = -49 + 2 = -47 \checkmark$

LaTeX source of the formulas on this page

\[ 7x + 2 = -47\ \Rightarrow\ x = -7 \]
\[ 7x + 2 = -47 \]
\[ 7x + 2 - 2 = -47 - 2 \ \Rightarrow\ 7x = -49 \]
\[ \frac{7x}{7} = \frac{-49}{7} \ \Rightarrow\ x = -7 \]
\[ 7\cdot(-7) + 2 = -49 + 2 = -47 \checkmark \]

Trying values of x in 7x + 2 = −47

x	7x + 2	Equals -47?
-9	-61	no
-8	-54	no
-7	-47	yes
-6	-40	no
-5	-33	no

Questions

What is x in 7x + 2 = −47?

The solution of 7x + 2 = −47 is x = -7.

How do you solve 7x + 2 = −47?

Subtract 2 from both sides to get 7x = -49, then divide both sides by 7 to get x = -7.

How do I check the answer?

Replace x by -7: 7(-7) + 2 = -47, which is -47.

Solve 7x + 2 = −47

How to work it out

Trying values of x in 7x + 2 = −47

Questions

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