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Solve 11x + 15 = 125

The solution of 11x + 15 = 125 is x = 10.

The lines y = 11x + 15 and y = 125 meet at x = 10468101214166080100120140160180200x = 10y = 11x + 15y = 125
The lines y = 11x + 15 and y = 125 meet at x = 10. 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.

    11x+15=12511x + 15 = 125
  2. 2

    Subtract 15 from both sides:

    11x+15−15=125−15 ⇒ 11x=11011x + 15 - 15 = 125 - 15 \ \Rightarrow\ 11x = 110
  3. 3

    Divide both sides by 11:

    11x11=11011 ⇒ x=10\frac{11x}{11} = \frac{110}{11} \ \Rightarrow\ x = 10
  4. 4

    Check: put x = 10 back into the equation.

    11⋅10+15=110+15=125✓11\cdot10 + 15 = 110 + 15 = 125 \checkmark
LaTeX source of the formulas on this page
\[ 11x + 15 = 125\ \Rightarrow\ x = 10 \]
\[ 11x + 15 = 125 \]
\[ 11x + 15 - 15 = 125 - 15 \ \Rightarrow\ 11x = 110 \]
\[ \frac{11x}{11} = \frac{110}{11} \ \Rightarrow\ x = 10 \]
\[ 11\cdot10 + 15 = 110 + 15 = 125 \checkmark \]

Trying values of x in 11x + 15 = 125

x11x + 15Equals 125?
8103no
9114no
10125yes
11136no
12147no

Questions

What is x in 11x + 15 = 125?

The solution of 11x + 15 = 125 is x = 10.

How do you solve 11x + 15 = 125?

Subtract 15 from both sides to get 11x = 110, then divide both sides by 11 to get x = 10.

How do I check the answer?

Replace x by 10: 11(10) + 15 = 125, which is 125.

Similar equations

    Solve 11x + 15 = 125: x = 10 (steps and check) | WordGPT