Solve 11x − 4 = 51

The solution of 11x − 4 = 51 is x = 5.

11x - 4 = 51\ \Rightarrow\ x = 5

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The lines y = 11x − 4 and y = 51 meet at x = 5. 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.
$11x - 4 = 51$
2
Add 4 to both sides:
$11x - 4 + 4 = 51 + 4 \ \Rightarrow\ 11x = 55$
3
Divide both sides by 11:
$\frac{11x}{11} = \frac{55}{11} \ \Rightarrow\ x = 5$
4
Check: put x = 5 back into the equation.
$11\cdot5 - 4 = 55 - 4 = 51 \checkmark$

LaTeX source of the formulas on this page

\[ 11x - 4 = 51\ \Rightarrow\ x = 5 \]
\[ 11x - 4 = 51 \]
\[ 11x - 4 + 4 = 51 + 4 \ \Rightarrow\ 11x = 55 \]
\[ \frac{11x}{11} = \frac{55}{11} \ \Rightarrow\ x = 5 \]
\[ 11\cdot5 - 4 = 55 - 4 = 51 \checkmark \]

Trying values of x in 11x − 4 = 51

x	11x − 4	Equals 51?
3	29	no
4	40	no
5	51	yes
6	62	no
7	73	no

Questions

What is x in 11x − 4 = 51?

The solution of 11x − 4 = 51 is x = 5.

How do you solve 11x − 4 = 51?

Add 4 to both sides to get 11x = 55, then divide both sides by 11 to get x = 5.

How do I check the answer?

Replace x by 5: 11(5) − 4 = 51, which is 51.

Solve 11x − 4 = 51

How to work it out

Trying values of x in 11x − 4 = 51

Questions

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