WordGPT

Solve 4x + 13 = 81

The solution of 4x + 13 = 81 is x = 17.

Explain it step by step in chatMake a short video of it
The lines y = 4x + 13 and y = 81 meet at x = 1712141618202260708090100110x = 17y = 4x + 13y = 81
The lines y = 4x + 13 and y = 81 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. 1

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

    4x+13=814x + 13 = 81
  2. 2

    Subtract 13 from both sides:

    4x+13−13=81−13 ⇒ 4x=684x + 13 - 13 = 81 - 13 \ \Rightarrow\ 4x = 68
  3. 3

    Divide both sides by 4:

    4x4=684 ⇒ x=17\frac{4x}{4} = \frac{68}{4} \ \Rightarrow\ x = 17
  4. 4

    Check: put x = 17 back into the equation.

    4⋅17+13=68+13=81✓4\cdot17 + 13 = 68 + 13 = 81 \checkmark
LaTeX source of the formulas on this page
\[ 4x + 13 = 81\ \Rightarrow\ x = 17 \]
\[ 4x + 13 = 81 \]
\[ 4x + 13 - 13 = 81 - 13 \ \Rightarrow\ 4x = 68 \]
\[ \frac{4x}{4} = \frac{68}{4} \ \Rightarrow\ x = 17 \]
\[ 4\cdot17 + 13 = 68 + 13 = 81 \checkmark \]

Trying values of x in 4x + 13 = 81

x4x + 13Equals 81?
1573no
1677no
1781yes
1885no
1989no

Questions

What is x in 4x + 13 = 81?

The solution of 4x + 13 = 81 is x = 17.

How do you solve 4x + 13 = 81?

Subtract 13 from both sides to get 4x = 68, then divide both sides by 4 to get x = 17.

How do I check the answer?

Replace x by 17: 4(17) + 13 = 81, which is 81.

Similar equations

    Solve 4x + 13 = 81: x = 17 (steps and check) | WordGPT