Solve 4x + 1 = −31

The solution of 4x + 1 = −31 is x = -8.

4x + 1 = -31\ \Rightarrow\ x = -8

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The lines y = 4x + 1 and y = -31 meet at x = -8. 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.
$4x + 1 = -31$
2
Subtract 1 from both sides:
$4x + 1 - 1 = -31 - 1 \ \Rightarrow\ 4x = -32$
3
Divide both sides by 4:
$\frac{4x}{4} = \frac{-32}{4} \ \Rightarrow\ x = -8$
4
Check: put x = -8 back into the equation.
$4\cdot(-8) + 1 = -32 + 1 = -31 \checkmark$

LaTeX source of the formulas on this page

\[ 4x + 1 = -31\ \Rightarrow\ x = -8 \]
\[ 4x + 1 = -31 \]
\[ 4x + 1 - 1 = -31 - 1 \ \Rightarrow\ 4x = -32 \]
\[ \frac{4x}{4} = \frac{-32}{4} \ \Rightarrow\ x = -8 \]
\[ 4\cdot(-8) + 1 = -32 + 1 = -31 \checkmark \]

Trying values of x in 4x + 1 = −31

x	4x + 1	Equals -31?
-10	-39	no
-9	-35	no
-8	-31	yes
-7	-27	no
-6	-23	no

Questions

What is x in 4x + 1 = −31?

The solution of 4x + 1 = −31 is x = -8.

How do you solve 4x + 1 = −31?

Subtract 1 from both sides to get 4x = -32, then divide both sides by 4 to get x = -8.

How do I check the answer?

Replace x by -8: 4(-8) + 1 = -31, which is -31.

Solve 4x + 1 = −31

How to work it out

Trying values of x in 4x + 1 = −31

Questions

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