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Solve 2x + 5 = 45

The solution of 2x + 5 = 45 is x = 20.

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The lines y = 2x + 5 and y = 45 meet at x = 20141618202224263540455055x = 20y = 2x + 5y = 45
The lines y = 2x + 5 and y = 45 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.

    2x+5=452x + 5 = 45
  2. 2

    Subtract 5 from both sides:

    2x+5−5=45−5 ⇒ 2x=402x + 5 - 5 = 45 - 5 \ \Rightarrow\ 2x = 40
  3. 3

    Divide both sides by 2:

    2x2=402 ⇒ x=20\frac{2x}{2} = \frac{40}{2} \ \Rightarrow\ x = 20
  4. 4

    Check: put x = 20 back into the equation.

    2⋅20+5=40+5=45✓2\cdot20 + 5 = 40 + 5 = 45 \checkmark
LaTeX source of the formulas on this page
\[ 2x + 5 = 45\ \Rightarrow\ x = 20 \]
\[ 2x + 5 = 45 \]
\[ 2x + 5 - 5 = 45 - 5 \ \Rightarrow\ 2x = 40 \]
\[ \frac{2x}{2} = \frac{40}{2} \ \Rightarrow\ x = 20 \]
\[ 2\cdot20 + 5 = 40 + 5 = 45 \checkmark \]

Trying values of x in 2x + 5 = 45

x2x + 5Equals 45?
1841no
1943no
2045yes
2147no
2249no

Questions

What is x in 2x + 5 = 45?

The solution of 2x + 5 = 45 is x = 20.

How do you solve 2x + 5 = 45?

Subtract 5 from both sides to get 2x = 40, then divide both sides by 2 to get x = 20.

How do I check the answer?

Replace x by 20: 2(20) + 5 = 45, which is 45.

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    Solve 2x + 5 = 45: x = 20 (steps and check) | WordGPT