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Solve 5x + 15 = 0

The solution of 5x + 15 = 0 is x = -3.

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The lines y = 5x + 15 and y = 0 meet at x = -3-8-6-4-22-30-20-10102030x = -3y = 5x + 15y = 0
The lines y = 5x + 15 and y = 0 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.

    5x+15=05x + 15 = 0
  2. 2

    Subtract 15 from both sides:

    5x+15āˆ’15=0āˆ’15Ā ā‡’Ā 5x=āˆ’155x + 15 - 15 = 0 - 15 \ \Rightarrow\ 5x = -15
  3. 3

    Divide both sides by 5:

    5x5=āˆ’155Ā ā‡’Ā x=āˆ’3\frac{5x}{5} = \frac{-15}{5} \ \Rightarrow\ x = -3
  4. 4

    Check: put x = -3 back into the equation.

    5ā‹…(āˆ’3)+15=āˆ’15+15=0āœ“5\cdot(-3) + 15 = -15 + 15 = 0 \checkmark
LaTeX source of the formulas on this page
\[ 5x + 15 = 0\ \Rightarrow\ x = -3 \]
\[ 5x + 15 = 0 \]
\[ 5x + 15 - 15 = 0 - 15 \ \Rightarrow\ 5x = -15 \]
\[ \frac{5x}{5} = \frac{-15}{5} \ \Rightarrow\ x = -3 \]
\[ 5\cdot(-3) + 15 = -15 + 15 = 0 \checkmark \]

Trying values of x in 5x + 15 = 0

x5x + 15Equals 0?
-5-10no
-4-5no
-30yes
-25no
-110no

Questions

What is x in 5x + 15 = 0?

The solution of 5x + 15 = 0 is x = -3.

How do you solve 5x + 15 = 0?

Subtract 15 from both sides to get 5x = -15, then divide both sides by 5 to get x = -3.

How do I check the answer?

Replace x by -3: 5(-3) + 15 = 0, which is 0.

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    Solve 5x + 15 = 0: x = -3 (steps and check) | WordGPT