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Solve 9x + 15 = 51

The solution of 9x + 15 = 51 is x = 4.

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The lines y = 9x + 15 and y = 51 meet at x = 4-224681020406080100x = 4y = 9x + 15y = 51
The lines y = 9x + 15 and y = 51 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.

    9x+15=519x + 15 = 51
  2. 2

    Subtract 15 from both sides:

    9x+15−15=51−15 ⇒ 9x=369x + 15 - 15 = 51 - 15 \ \Rightarrow\ 9x = 36
  3. 3

    Divide both sides by 9:

    9x9=369 ⇒ x=4\frac{9x}{9} = \frac{36}{9} \ \Rightarrow\ x = 4
  4. 4

    Check: put x = 4 back into the equation.

    9⋅4+15=36+15=51✓9\cdot4 + 15 = 36 + 15 = 51 \checkmark
LaTeX source of the formulas on this page
\[ 9x + 15 = 51\ \Rightarrow\ x = 4 \]
\[ 9x + 15 = 51 \]
\[ 9x + 15 - 15 = 51 - 15 \ \Rightarrow\ 9x = 36 \]
\[ \frac{9x}{9} = \frac{36}{9} \ \Rightarrow\ x = 4 \]
\[ 9\cdot4 + 15 = 36 + 15 = 51 \checkmark \]

Trying values of x in 9x + 15 = 51

x9x + 15Equals 51?
233no
342no
451yes
560no
669no

Questions

What is x in 9x + 15 = 51?

The solution of 9x + 15 = 51 is x = 4.

How do you solve 9x + 15 = 51?

Subtract 15 from both sides to get 9x = 36, then divide both sides by 9 to get x = 4.

How do I check the answer?

Replace x by 4: 9(4) + 15 = 51, which is 51.

Similar equations

    Solve 9x + 15 = 51: x = 4 (steps and check) | WordGPT