Solve 8x + 11 = −45

The solution of 8x + 11 = −45 is x = -7.

8x + 11 = -45\ \Rightarrow\ x = -7

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The lines y = 8x + 11 and y = -45 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.
$8x + 11 = -45$
2
Subtract 11 from both sides:
$8x + 11 - 11 = -45 - 11 \ \Rightarrow\ 8x = -56$
3
Divide both sides by 8:
$\frac{8x}{8} = \frac{-56}{8} \ \Rightarrow\ x = -7$
4
Check: put x = -7 back into the equation.
$8\cdot(-7) + 11 = -56 + 11 = -45 \checkmark$

LaTeX source of the formulas on this page

\[ 8x + 11 = -45\ \Rightarrow\ x = -7 \]
\[ 8x + 11 = -45 \]
\[ 8x + 11 - 11 = -45 - 11 \ \Rightarrow\ 8x = -56 \]
\[ \frac{8x}{8} = \frac{-56}{8} \ \Rightarrow\ x = -7 \]
\[ 8\cdot(-7) + 11 = -56 + 11 = -45 \checkmark \]

Trying values of x in 8x + 11 = −45

x	8x + 11	Equals -45?
-9	-61	no
-8	-53	no
-7	-45	yes
-6	-37	no
-5	-29	no

Questions

What is x in 8x + 11 = −45?

The solution of 8x + 11 = −45 is x = -7.

How do you solve 8x + 11 = −45?

Subtract 11 from both sides to get 8x = -56, then divide both sides by 8 to get x = -7.

How do I check the answer?

Replace x by -7: 8(-7) + 11 = -45, which is -45.

Solve 8x + 11 = −45

How to work it out

Trying values of x in 8x + 11 = −45

Questions

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