WordGPT

Solve 8x + 15 = 79

The solution of 8x + 15 = 79 is x = 8.

Explain it step by step in chatMake a short video of it
The lines y = 8x + 15 and y = 79 meet at x = 82468101214406080100120x = 8y = 8x + 15y = 79
The lines y = 8x + 15 and y = 79 meet at x = 8. 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+15=798x + 15 = 79
  2. 2

    Subtract 15 from both sides:

    8x+15−15=79−15 ⇒ 8x=648x + 15 - 15 = 79 - 15 \ \Rightarrow\ 8x = 64
  3. 3

    Divide both sides by 8:

    8x8=648 ⇒ x=8\frac{8x}{8} = \frac{64}{8} \ \Rightarrow\ x = 8
  4. 4

    Check: put x = 8 back into the equation.

    8⋅8+15=64+15=79✓8\cdot8 + 15 = 64 + 15 = 79 \checkmark
LaTeX source of the formulas on this page
\[ 8x + 15 = 79\ \Rightarrow\ x = 8 \]
\[ 8x + 15 = 79 \]
\[ 8x + 15 - 15 = 79 - 15 \ \Rightarrow\ 8x = 64 \]
\[ \frac{8x}{8} = \frac{64}{8} \ \Rightarrow\ x = 8 \]
\[ 8\cdot8 + 15 = 64 + 15 = 79 \checkmark \]

Trying values of x in 8x + 15 = 79

x8x + 15Equals 79?
663no
771no
879yes
987no
1095no

Questions

What is x in 8x + 15 = 79?

The solution of 8x + 15 = 79 is x = 8.

How do you solve 8x + 15 = 79?

Subtract 15 from both sides to get 8x = 64, then divide both sides by 8 to get x = 8.

How do I check the answer?

Replace x by 8: 8(8) + 15 = 79, which is 79.

Similar equations

    Solve 8x + 15 = 79: x = 8 (steps and check) | WordGPT