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Solve 4x + 13 = 25

The solution of 4x + 13 = 25 is x = 3.

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The lines y = 4x + 13 and y = 25 meet at x = 3-224681020304050x = 3y = 4x + 13y = 25
The lines y = 4x + 13 and y = 25 meet at x = 3. 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=254x + 13 = 25
  2. 2

    Subtract 13 from both sides:

    4x+13−13=25−13 ⇒ 4x=124x + 13 - 13 = 25 - 13 \ \Rightarrow\ 4x = 12
  3. 3

    Divide both sides by 4:

    4x4=124 ⇒ x=3\frac{4x}{4} = \frac{12}{4} \ \Rightarrow\ x = 3
  4. 4

    Check: put x = 3 back into the equation.

    4⋅3+13=12+13=25✓4\cdot3 + 13 = 12 + 13 = 25 \checkmark
LaTeX source of the formulas on this page
\[ 4x + 13 = 25\ \Rightarrow\ x = 3 \]
\[ 4x + 13 = 25 \]
\[ 4x + 13 - 13 = 25 - 13 \ \Rightarrow\ 4x = 12 \]
\[ \frac{4x}{4} = \frac{12}{4} \ \Rightarrow\ x = 3 \]
\[ 4\cdot3 + 13 = 12 + 13 = 25 \checkmark \]

Trying values of x in 4x + 13 = 25

x4x + 13Equals 25?
117no
221no
325yes
429no
533no

Questions

What is x in 4x + 13 = 25?

The solution of 4x + 13 = 25 is x = 3.

How do you solve 4x + 13 = 25?

Subtract 13 from both sides to get 4x = 12, then divide both sides by 4 to get x = 3.

How do I check the answer?

Replace x by 3: 4(3) + 13 = 25, which is 25.

Similar equations

    Solve 4x + 13 = 25: x = 3 (steps and check) | WordGPT