Solve 11x − 8 = 69

The solution of 11x − 8 = 69 is x = 7.

11x - 8 = 69\ \Rightarrow\ x = 7

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The lines y = 11x − 8 and y = 69 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 subtraction, then the multiplication.
$11x - 8 = 69$
2
Add 8 to both sides:
$11x - 8 + 8 = 69 + 8 \ \Rightarrow\ 11x = 77$
3
Divide both sides by 11:
$\frac{11x}{11} = \frac{77}{11} \ \Rightarrow\ x = 7$
4
Check: put x = 7 back into the equation.
$11\cdot7 - 8 = 77 - 8 = 69 \checkmark$

LaTeX source of the formulas on this page

\[ 11x - 8 = 69\ \Rightarrow\ x = 7 \]
\[ 11x - 8 = 69 \]
\[ 11x - 8 + 8 = 69 + 8 \ \Rightarrow\ 11x = 77 \]
\[ \frac{11x}{11} = \frac{77}{11} \ \Rightarrow\ x = 7 \]
\[ 11\cdot7 - 8 = 77 - 8 = 69 \checkmark \]

Trying values of x in 11x − 8 = 69

x	11x − 8	Equals 69?
5	47	no
6	58	no
7	69	yes
8	80	no
9	91	no

Questions

What is x in 11x − 8 = 69?

The solution of 11x − 8 = 69 is x = 7.

How do you solve 11x − 8 = 69?

Add 8 to both sides to get 11x = 77, then divide both sides by 11 to get x = 7.

How do I check the answer?

Replace x by 7: 11(7) − 8 = 69, which is 69.

Solve 11x − 8 = 69

How to work it out

Trying values of x in 11x − 8 = 69

Questions

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