Solve 2x − 15 = 23

The solution of 2x − 15 = 23 is x = 19.

2x - 15 = 23\ \Rightarrow\ x = 19

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The lines y = 2x − 15 and y = 23 meet at x = 19. 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.
$2x - 15 = 23$
2
Add 15 to both sides:
$2x - 15 + 15 = 23 + 15 \ \Rightarrow\ 2x = 38$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{38}{2} \ \Rightarrow\ x = 19$
4
Check: put x = 19 back into the equation.
$2\cdot19 - 15 = 38 - 15 = 23 \checkmark$

LaTeX source of the formulas on this page

\[ 2x - 15 = 23\ \Rightarrow\ x = 19 \]
\[ 2x - 15 = 23 \]
\[ 2x - 15 + 15 = 23 + 15 \ \Rightarrow\ 2x = 38 \]
\[ \frac{2x}{2} = \frac{38}{2} \ \Rightarrow\ x = 19 \]
\[ 2\cdot19 - 15 = 38 - 15 = 23 \checkmark \]

Trying values of x in 2x − 15 = 23

x	2x − 15	Equals 23?
17	19	no
18	21	no
19	23	yes
20	25	no
21	27	no

Questions

What is x in 2x − 15 = 23?

The solution of 2x − 15 = 23 is x = 19.

How do you solve 2x − 15 = 23?

Add 15 to both sides to get 2x = 38, then divide both sides by 2 to get x = 19.

How do I check the answer?

Replace x by 19: 2(19) − 15 = 23, which is 23.

Solve 2x − 15 = 23

How to work it out

Trying values of x in 2x − 15 = 23

Questions

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