Solve 12x − 1 = 47

The solution of 12x − 1 = 47 is x = 4.

12x - 1 = 47\ \Rightarrow\ x = 4

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The lines y = 12x − 1 and y = 47 meet at x = 4. 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.
$12x - 1 = 47$
2
Add 1 to both sides:
$12x - 1 + 1 = 47 + 1 \ \Rightarrow\ 12x = 48$
3
Divide both sides by 12:
$\frac{12x}{12} = \frac{48}{12} \ \Rightarrow\ x = 4$
4
Check: put x = 4 back into the equation.
$12\cdot4 - 1 = 48 - 1 = 47 \checkmark$

LaTeX source of the formulas on this page

\[ 12x - 1 = 47\ \Rightarrow\ x = 4 \]
\[ 12x - 1 = 47 \]
\[ 12x - 1 + 1 = 47 + 1 \ \Rightarrow\ 12x = 48 \]
\[ \frac{12x}{12} = \frac{48}{12} \ \Rightarrow\ x = 4 \]
\[ 12\cdot4 - 1 = 48 - 1 = 47 \checkmark \]

Trying values of x in 12x − 1 = 47

x	12x − 1	Equals 47?
2	23	no
3	35	no
4	47	yes
5	59	no
6	71	no

Questions

What is x in 12x − 1 = 47?

The solution of 12x − 1 = 47 is x = 4.

How do you solve 12x − 1 = 47?

Add 1 to both sides to get 12x = 48, then divide both sides by 12 to get x = 4.

How do I check the answer?

Replace x by 4: 12(4) − 1 = 47, which is 47.

Solve 12x − 1 = 47

How to work it out

Trying values of x in 12x − 1 = 47

Questions

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