Solve 12x − 13 = 191

The solution of 12x − 13 = 191 is x = 17.

12x - 13 = 191\ \Rightarrow\ x = 17

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The lines y = 12x − 13 and y = 191 meet at x = 17. 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.
$12x - 13 = 191$
2
Add 13 to both sides:
$12x - 13 + 13 = 191 + 13 \ \Rightarrow\ 12x = 204$
3
Divide both sides by 12:
$\frac{12x}{12} = \frac{204}{12} \ \Rightarrow\ x = 17$
4
Check: put x = 17 back into the equation.
$12\cdot17 - 13 = 204 - 13 = 191 \checkmark$

LaTeX source of the formulas on this page

\[ 12x - 13 = 191\ \Rightarrow\ x = 17 \]
\[ 12x - 13 = 191 \]
\[ 12x - 13 + 13 = 191 + 13 \ \Rightarrow\ 12x = 204 \]
\[ \frac{12x}{12} = \frac{204}{12} \ \Rightarrow\ x = 17 \]
\[ 12\cdot17 - 13 = 204 - 13 = 191 \checkmark \]

Trying values of x in 12x − 13 = 191

x	12x − 13	Equals 191?
15	167	no
16	179	no
17	191	yes
18	203	no
19	215	no

Questions

What is x in 12x − 13 = 191?

The solution of 12x − 13 = 191 is x = 17.

How do you solve 12x − 13 = 191?

Add 13 to both sides to get 12x = 204, then divide both sides by 12 to get x = 17.

How do I check the answer?

Replace x by 17: 12(17) − 13 = 191, which is 191.

Solve 12x − 13 = 191

How to work it out

Trying values of x in 12x − 13 = 191

Questions

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