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Solve 10x + 15 = 55

The solution of 10x + 15 = 55 is x = 4.

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The lines y = 10x + 15 and y = 55 meet at x = 4-224681020406080100120x = 4y = 10x + 15y = 55
The lines y = 10x + 15 and y = 55 meet at x = 4. 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.

    10x+15=5510x + 15 = 55
  2. 2

    Subtract 15 from both sides:

    10x+15−15=55−15 ⇒ 10x=4010x + 15 - 15 = 55 - 15 \ \Rightarrow\ 10x = 40
  3. 3

    Divide both sides by 10:

    10x10=4010 ⇒ x=4\frac{10x}{10} = \frac{40}{10} \ \Rightarrow\ x = 4
  4. 4

    Check: put x = 4 back into the equation.

    10⋅4+15=40+15=55✓10\cdot4 + 15 = 40 + 15 = 55 \checkmark
LaTeX source of the formulas on this page
\[ 10x + 15 = 55\ \Rightarrow\ x = 4 \]
\[ 10x + 15 = 55 \]
\[ 10x + 15 - 15 = 55 - 15 \ \Rightarrow\ 10x = 40 \]
\[ \frac{10x}{10} = \frac{40}{10} \ \Rightarrow\ x = 4 \]
\[ 10\cdot4 + 15 = 40 + 15 = 55 \checkmark \]

Trying values of x in 10x + 15 = 55

x10x + 15Equals 55?
235no
345no
455yes
565no
675no

Questions

What is x in 10x + 15 = 55?

The solution of 10x + 15 = 55 is x = 4.

How do you solve 10x + 15 = 55?

Subtract 15 from both sides to get 10x = 40, then divide both sides by 10 to get x = 4.

How do I check the answer?

Replace x by 4: 10(4) + 15 = 55, which is 55.

Similar equations

    Solve 10x + 15 = 55: x = 4 (steps and check) | WordGPT