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Solve 4x + 15 = 27

The solution of 4x + 15 = 27 is x = 3.

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The lines y = 4x + 15 and y = 27 meet at x = 3-224681020304050x = 3y = 4x + 15y = 27
The lines y = 4x + 15 and y = 27 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+15=274x + 15 = 27
  2. 2

    Subtract 15 from both sides:

    4x+15−15=27−15 ⇒ 4x=124x + 15 - 15 = 27 - 15 \ \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+15=12+15=27✓4\cdot3 + 15 = 12 + 15 = 27 \checkmark
LaTeX source of the formulas on this page
\[ 4x + 15 = 27\ \Rightarrow\ x = 3 \]
\[ 4x + 15 = 27 \]
\[ 4x + 15 - 15 = 27 - 15 \ \Rightarrow\ 4x = 12 \]
\[ \frac{4x}{4} = \frac{12}{4} \ \Rightarrow\ x = 3 \]
\[ 4\cdot3 + 15 = 12 + 15 = 27 \checkmark \]

Trying values of x in 4x + 15 = 27

x4x + 15Equals 27?
119no
223no
327yes
431no
535no

Questions

What is x in 4x + 15 = 27?

The solution of 4x + 15 = 27 is x = 3.

How do you solve 4x + 15 = 27?

Subtract 15 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) + 15 = 27, which is 27.

Similar equations

    Solve 4x + 15 = 27: x = 3 (steps and check) | WordGPT