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Solve 9x + 15 = 159

The solution of 9x + 15 = 159 is x = 16.

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The lines y = 9x + 15 and y = 159 meet at x = 1610121416182022100120140160180200220x = 16y = 9x + 15y = 159
The lines y = 9x + 15 and y = 159 meet at x = 16. 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=1599x + 15 = 159
  2. 2

    Subtract 15 from both sides:

    9x+15−15=159−15 ⇒ 9x=1449x + 15 - 15 = 159 - 15 \ \Rightarrow\ 9x = 144
  3. 3

    Divide both sides by 9:

    9x9=1449 ⇒ x=16\frac{9x}{9} = \frac{144}{9} \ \Rightarrow\ x = 16
  4. 4

    Check: put x = 16 back into the equation.

    9⋅16+15=144+15=159✓9\cdot16 + 15 = 144 + 15 = 159 \checkmark
LaTeX source of the formulas on this page
\[ 9x + 15 = 159\ \Rightarrow\ x = 16 \]
\[ 9x + 15 = 159 \]
\[ 9x + 15 - 15 = 159 - 15 \ \Rightarrow\ 9x = 144 \]
\[ \frac{9x}{9} = \frac{144}{9} \ \Rightarrow\ x = 16 \]
\[ 9\cdot16 + 15 = 144 + 15 = 159 \checkmark \]

Trying values of x in 9x + 15 = 159

x9x + 15Equals 159?
14141no
15150no
16159yes
17168no
18177no

Questions

What is x in 9x + 15 = 159?

The solution of 9x + 15 = 159 is x = 16.

How do you solve 9x + 15 = 159?

Subtract 15 from both sides to get 9x = 144, then divide both sides by 9 to get x = 16.

How do I check the answer?

Replace x by 16: 9(16) + 15 = 159, which is 159.

Similar equations

    Solve 9x + 15 = 159: x = 16 (steps and check) | WordGPT