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Solve 5x + 15 = 75

The solution of 5x + 15 = 75 is x = 12.

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The lines y = 5x + 15 and y = 75 meet at x = 12681012141618405060708090100110x = 12y = 5x + 15y = 75
The lines y = 5x + 15 and y = 75 meet at x = 12. 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=755x + 15 = 75
  2. 2

    Subtract 15 from both sides:

    5x+15−15=75−15 ⇒ 5x=605x + 15 - 15 = 75 - 15 \ \Rightarrow\ 5x = 60
  3. 3

    Divide both sides by 5:

    5x5=605 ⇒ x=12\frac{5x}{5} = \frac{60}{5} \ \Rightarrow\ x = 12
  4. 4

    Check: put x = 12 back into the equation.

    5⋅12+15=60+15=75✓5\cdot12 + 15 = 60 + 15 = 75 \checkmark
LaTeX source of the formulas on this page
\[ 5x + 15 = 75\ \Rightarrow\ x = 12 \]
\[ 5x + 15 = 75 \]
\[ 5x + 15 - 15 = 75 - 15 \ \Rightarrow\ 5x = 60 \]
\[ \frac{5x}{5} = \frac{60}{5} \ \Rightarrow\ x = 12 \]
\[ 5\cdot12 + 15 = 60 + 15 = 75 \checkmark \]

Trying values of x in 5x + 15 = 75

x5x + 15Equals 75?
1065no
1170no
1275yes
1380no
1485no

Questions

What is x in 5x + 15 = 75?

The solution of 5x + 15 = 75 is x = 12.

How do you solve 5x + 15 = 75?

Subtract 15 from both sides to get 5x = 60, then divide both sides by 5 to get x = 12.

How do I check the answer?

Replace x by 12: 5(12) + 15 = 75, which is 75.

Similar equations

    Solve 5x + 15 = 75: x = 12 (steps and check) | WordGPT