Solve 2x + 15 = 25

The solution of 2x + 15 = 25 is x = 5.

2x + 15 = 25\ \Rightarrow\ x = 5

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The lines y = 2x + 15 and y = 25 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 addition, then the multiplication.
$2x + 15 = 25$
2
Subtract 15 from both sides:
$2x + 15 - 15 = 25 - 15 \ \Rightarrow\ 2x = 10$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{10}{2} \ \Rightarrow\ x = 5$
4
Check: put x = 5 back into the equation.
$2\cdot5 + 15 = 10 + 15 = 25 \checkmark$

LaTeX source of the formulas on this page

\[ 2x + 15 = 25\ \Rightarrow\ x = 5 \]
\[ 2x + 15 = 25 \]
\[ 2x + 15 - 15 = 25 - 15 \ \Rightarrow\ 2x = 10 \]
\[ \frac{2x}{2} = \frac{10}{2} \ \Rightarrow\ x = 5 \]
\[ 2\cdot5 + 15 = 10 + 15 = 25 \checkmark \]

Trying values of x in 2x + 15 = 25

x	2x + 15	Equals 25?
3	21	no
4	23	no
5	25	yes
6	27	no
7	29	no

Questions

What is x in 2x + 15 = 25?

The solution of 2x + 15 = 25 is x = 5.

How do you solve 2x + 15 = 25?

Subtract 15 from both sides to get 2x = 10, then divide both sides by 2 to get x = 5.

How do I check the answer?

Replace x by 5: 2(5) + 15 = 25, which is 25.

Solve 2x + 15 = 25

How to work it out

Trying values of x in 2x + 15 = 25

Questions

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