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Solve 5x + 15 = 115

The solution of 5x + 15 = 115 is x = 20.

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The lines y = 5x + 15 and y = 115 meet at x = 20141618202224268090100110120130140150x = 20y = 5x + 15y = 115
The lines y = 5x + 15 and y = 115 meet at x = 20. 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=1155x + 15 = 115
  2. 2

    Subtract 15 from both sides:

    5x+15−15=115−15 ⇒ 5x=1005x + 15 - 15 = 115 - 15 \ \Rightarrow\ 5x = 100
  3. 3

    Divide both sides by 5:

    5x5=1005 ⇒ x=20\frac{5x}{5} = \frac{100}{5} \ \Rightarrow\ x = 20
  4. 4

    Check: put x = 20 back into the equation.

    5⋅20+15=100+15=115✓5\cdot20 + 15 = 100 + 15 = 115 \checkmark
LaTeX source of the formulas on this page
\[ 5x + 15 = 115\ \Rightarrow\ x = 20 \]
\[ 5x + 15 = 115 \]
\[ 5x + 15 - 15 = 115 - 15 \ \Rightarrow\ 5x = 100 \]
\[ \frac{5x}{5} = \frac{100}{5} \ \Rightarrow\ x = 20 \]
\[ 5\cdot20 + 15 = 100 + 15 = 115 \checkmark \]

Trying values of x in 5x + 15 = 115

x5x + 15Equals 115?
18105no
19110no
20115yes
21120no
22125no

Questions

What is x in 5x + 15 = 115?

The solution of 5x + 15 = 115 is x = 20.

How do you solve 5x + 15 = 115?

Subtract 15 from both sides to get 5x = 100, then divide both sides by 5 to get x = 20.

How do I check the answer?

Replace x by 20: 5(20) + 15 = 115, which is 115.

Similar equations

    Solve 5x + 15 = 115: x = 20 (steps and check) | WordGPT