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Solve 5x + 15 = 40

The solution of 5x + 15 = 40 is x = 5.

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The lines y = 5x + 15 and y = 40 meet at x = 524681010203040506070x = 5y = 5x + 15y = 40
The lines y = 5x + 15 and y = 40 meet at x = 5. 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=405x + 15 = 40
  2. 2

    Subtract 15 from both sides:

    5x+15−15=40−15 ⇒ 5x=255x + 15 - 15 = 40 - 15 \ \Rightarrow\ 5x = 25
  3. 3

    Divide both sides by 5:

    5x5=255 ⇒ x=5\frac{5x}{5} = \frac{25}{5} \ \Rightarrow\ x = 5
  4. 4

    Check: put x = 5 back into the equation.

    5⋅5+15=25+15=40✓5\cdot5 + 15 = 25 + 15 = 40 \checkmark
LaTeX source of the formulas on this page
\[ 5x + 15 = 40\ \Rightarrow\ x = 5 \]
\[ 5x + 15 = 40 \]
\[ 5x + 15 - 15 = 40 - 15 \ \Rightarrow\ 5x = 25 \]
\[ \frac{5x}{5} = \frac{25}{5} \ \Rightarrow\ x = 5 \]
\[ 5\cdot5 + 15 = 25 + 15 = 40 \checkmark \]

Trying values of x in 5x + 15 = 40

x5x + 15Equals 40?
330no
435no
540yes
645no
750no

Questions

What is x in 5x + 15 = 40?

The solution of 5x + 15 = 40 is x = 5.

How do you solve 5x + 15 = 40?

Subtract 15 from both sides to get 5x = 25, then divide both sides by 5 to get x = 5.

How do I check the answer?

Replace x by 5: 5(5) + 15 = 40, which is 40.

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    Solve 5x + 15 = 40: x = 5 (steps and check) | WordGPT