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Solve 8x + 7 = 15

The solution of 8x + 7 = 15 is x = 1.

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The lines y = 8x + 7 and y = 15 meet at x = 1-4-2246-40-20204060x = 1y = 8x + 7y = 15
The lines y = 8x + 7 and y = 15 meet at x = 1. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

  1. 1

    The goal is to get x alone. Undo the operations in the opposite order: first the addition, then the multiplication.

    8x+7=158x + 7 = 15
  2. 2

    Subtract 7 from both sides:

    8x+7−7=15−7 ⇒ 8x=88x + 7 - 7 = 15 - 7 \ \Rightarrow\ 8x = 8
  3. 3

    Divide both sides by 8:

    8x8=88 ⇒ x=1\frac{8x}{8} = \frac{8}{8} \ \Rightarrow\ x = 1
  4. 4

    Check: put x = 1 back into the equation.

    8⋅1+7=8+7=15✓8\cdot1 + 7 = 8 + 7 = 15 \checkmark
LaTeX source of the formulas on this page
\[ 8x + 7 = 15\ \Rightarrow\ x = 1 \]
\[ 8x + 7 = 15 \]
\[ 8x + 7 - 7 = 15 - 7 \ \Rightarrow\ 8x = 8 \]
\[ \frac{8x}{8} = \frac{8}{8} \ \Rightarrow\ x = 1 \]
\[ 8\cdot1 + 7 = 8 + 7 = 15 \checkmark \]

Trying values of x in 8x + 7 = 15

x8x + 7Equals 15?
-1-1no
07no
115yes
223no
331no

Questions

What is x in 8x + 7 = 15?

The solution of 8x + 7 = 15 is x = 1.

How do you solve 8x + 7 = 15?

Subtract 7 from both sides to get 8x = 8, then divide both sides by 8 to get x = 1.

How do I check the answer?

Replace x by 1: 8(1) + 7 = 15, which is 15.

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    Solve 8x + 7 = 15: x = 1 (steps and check) | WordGPT