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Solve 6x + 9 = 87

The solution of 6x + 9 = 87 is x = 13.

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The lines y = 6x + 9 and y = 87 meet at x = 13810121416185060708090100110120130x = 13y = 6x + 9y = 87
The lines y = 6x + 9 and y = 87 meet at x = 13. 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.

    6x+9=876x + 9 = 87
  2. 2

    Subtract 9 from both sides:

    6x+9−9=87−9 ⇒ 6x=786x + 9 - 9 = 87 - 9 \ \Rightarrow\ 6x = 78
  3. 3

    Divide both sides by 6:

    6x6=786 ⇒ x=13\frac{6x}{6} = \frac{78}{6} \ \Rightarrow\ x = 13
  4. 4

    Check: put x = 13 back into the equation.

    6⋅13+9=78+9=87✓6\cdot13 + 9 = 78 + 9 = 87 \checkmark
LaTeX source of the formulas on this page
\[ 6x + 9 = 87\ \Rightarrow\ x = 13 \]
\[ 6x + 9 = 87 \]
\[ 6x + 9 - 9 = 87 - 9 \ \Rightarrow\ 6x = 78 \]
\[ \frac{6x}{6} = \frac{78}{6} \ \Rightarrow\ x = 13 \]
\[ 6\cdot13 + 9 = 78 + 9 = 87 \checkmark \]

Trying values of x in 6x + 9 = 87

x6x + 9Equals 87?
1175no
1281no
1387yes
1493no
1599no

Questions

What is x in 6x + 9 = 87?

The solution of 6x + 9 = 87 is x = 13.

How do you solve 6x + 9 = 87?

Subtract 9 from both sides to get 6x = 78, then divide both sides by 6 to get x = 13.

How do I check the answer?

Replace x by 13: 6(13) + 9 = 87, which is 87.

Similar equations

    Solve 6x + 9 = 87: x = 13 (steps and check) | WordGPT