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Solve 4x + 9 = 9

The solution of 4x + 9 = 9 is x = 0.

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The lines y = 4x + 9 and y = 9 meet at x = 0-6-4-2246-10102030x = 0y = 4x + 9y = 9
The lines y = 4x + 9 and y = 9 meet at x = 0. 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=94x + 9 = 9
  2. 2

    Subtract 9 from both sides:

    4x+9−9=9−9 ⇒ 4x=04x + 9 - 9 = 9 - 9 \ \Rightarrow\ 4x = 0
  3. 3

    Divide both sides by 4:

    4x4=04 ⇒ x=0\frac{4x}{4} = \frac{0}{4} \ \Rightarrow\ x = 0
  4. 4

    Check: put x = 0 back into the equation.

    4⋅0+9=0+9=9✓4\cdot0 + 9 = 0 + 9 = 9 \checkmark
LaTeX source of the formulas on this page
\[ 4x + 9 = 9\ \Rightarrow\ x = 0 \]
\[ 4x + 9 = 9 \]
\[ 4x + 9 - 9 = 9 - 9 \ \Rightarrow\ 4x = 0 \]
\[ \frac{4x}{4} = \frac{0}{4} \ \Rightarrow\ x = 0 \]
\[ 4\cdot0 + 9 = 0 + 9 = 9 \checkmark \]

Trying values of x in 4x + 9 = 9

x4x + 9Equals 9?
-21no
-15no
09yes
113no
217no

Questions

What is x in 4x + 9 = 9?

The solution of 4x + 9 = 9 is x = 0.

How do you solve 4x + 9 = 9?

Subtract 9 from both sides to get 4x = 0, then divide both sides by 4 to get x = 0.

How do I check the answer?

Replace x by 0: 4(0) + 9 = 9, which is 9.

Similar equations

    Solve 4x + 9 = 9: x = 0 (steps and check) | WordGPT