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Solve 4x + 9 = 13

The solution of 4x + 9 = 13 is x = 1.

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The lines y = 4x + 9 and y = 13 meet at x = 1-4-2246-1010203040x = 1y = 4x + 9y = 13
The lines y = 4x + 9 and y = 13 meet at x = 1. 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.

    4x+9=134x + 9 = 13
  2. 2

    Subtract 9 from both sides:

    4x+9−9=13−9 ⇒ 4x=44x + 9 - 9 = 13 - 9 \ \Rightarrow\ 4x = 4
  3. 3

    Divide both sides by 4:

    4x4=44 ⇒ x=1\frac{4x}{4} = \frac{4}{4} \ \Rightarrow\ x = 1
  4. 4

    Check: put x = 1 back into the equation.

    4⋅1+9=4+9=13✓4\cdot1 + 9 = 4 + 9 = 13 \checkmark
LaTeX source of the formulas on this page
\[ 4x + 9 = 13\ \Rightarrow\ x = 1 \]
\[ 4x + 9 = 13 \]
\[ 4x + 9 - 9 = 13 - 9 \ \Rightarrow\ 4x = 4 \]
\[ \frac{4x}{4} = \frac{4}{4} \ \Rightarrow\ x = 1 \]
\[ 4\cdot1 + 9 = 4 + 9 = 13 \checkmark \]

Trying values of x in 4x + 9 = 13

x4x + 9Equals 13?
-15no
09no
113yes
217no
321no

Questions

What is x in 4x + 9 = 13?

The solution of 4x + 9 = 13 is x = 1.

How do you solve 4x + 9 = 13?

Subtract 9 from both sides to get 4x = 4, then divide both sides by 4 to get x = 1.

How do I check the answer?

Replace x by 1: 4(1) + 9 = 13, which is 13.

Similar equations

    Solve 4x + 9 = 13: x = 1 (steps and check) | WordGPT