WordGPT

Solve 4x + 13 = 21

The solution of 4x + 13 = 21 is x = 2.

Explain it step by step in chatMake a short video of it
The lines y = 4x + 13 and y = 21 meet at x = 2-4-224681020304050x = 2y = 4x + 13y = 21
The lines y = 4x + 13 and y = 21 meet at x = 2. 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=214x + 13 = 21
  2. 2

    Subtract 13 from both sides:

    4x+13−13=21−13 ⇒ 4x=84x + 13 - 13 = 21 - 13 \ \Rightarrow\ 4x = 8
  3. 3

    Divide both sides by 4:

    4x4=84 ⇒ x=2\frac{4x}{4} = \frac{8}{4} \ \Rightarrow\ x = 2
  4. 4

    Check: put x = 2 back into the equation.

    4⋅2+13=8+13=21✓4\cdot2 + 13 = 8 + 13 = 21 \checkmark
LaTeX source of the formulas on this page
\[ 4x + 13 = 21\ \Rightarrow\ x = 2 \]
\[ 4x + 13 = 21 \]
\[ 4x + 13 - 13 = 21 - 13 \ \Rightarrow\ 4x = 8 \]
\[ \frac{4x}{4} = \frac{8}{4} \ \Rightarrow\ x = 2 \]
\[ 4\cdot2 + 13 = 8 + 13 = 21 \checkmark \]

Trying values of x in 4x + 13 = 21

x4x + 13Equals 21?
013no
117no
221yes
325no
429no

Questions

What is x in 4x + 13 = 21?

The solution of 4x + 13 = 21 is x = 2.

How do you solve 4x + 13 = 21?

Subtract 13 from both sides to get 4x = 8, then divide both sides by 4 to get x = 2.

How do I check the answer?

Replace x by 2: 4(2) + 13 = 21, which is 21.

Similar equations

    Solve 4x + 13 = 21: x = 2 (steps and check) | WordGPT