Solve 4x − 1 = 11

The solution of 4x − 1 = 11 is x = 3.

4x - 1 = 11\ \Rightarrow\ x = 3

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The lines y = 4x − 1 and y = 11 meet at x = 3. 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.
$4x - 1 = 11$
2
Add 1 to both sides:
$4x - 1 + 1 = 11 + 1 \ \Rightarrow\ 4x = 12$
3
Divide both sides by 4:
$\frac{4x}{4} = \frac{12}{4} \ \Rightarrow\ x = 3$
4
Check: put x = 3 back into the equation.
$4\cdot3 - 1 = 12 - 1 = 11 \checkmark$

LaTeX source of the formulas on this page

\[ 4x - 1 = 11\ \Rightarrow\ x = 3 \]
\[ 4x - 1 = 11 \]
\[ 4x - 1 + 1 = 11 + 1 \ \Rightarrow\ 4x = 12 \]
\[ \frac{4x}{4} = \frac{12}{4} \ \Rightarrow\ x = 3 \]
\[ 4\cdot3 - 1 = 12 - 1 = 11 \checkmark \]

Trying values of x in 4x − 1 = 11

x	4x − 1	Equals 11?
1	3	no
2	7	no
3	11	yes
4	15	no
5	19	no

Questions

What is x in 4x − 1 = 11?

The solution of 4x − 1 = 11 is x = 3.

How do you solve 4x − 1 = 11?

Add 1 to both sides to get 4x = 12, then divide both sides by 4 to get x = 3.

How do I check the answer?

Replace x by 3: 4(3) − 1 = 11, which is 11.

Solve 4x − 1 = 11

How to work it out

Trying values of x in 4x − 1 = 11

Questions

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