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Solve 9x + 5 = 77

The solution of 9x + 5 = 77 is x = 8.

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The lines y = 9x + 5 and y = 77 meet at x = 8246810121420406080100120140x = 8y = 9x + 5y = 77
The lines y = 9x + 5 and y = 77 meet at x = 8. 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+5=779x + 5 = 77
  2. 2

    Subtract 5 from both sides:

    9x+5−5=77−5 ⇒ 9x=729x + 5 - 5 = 77 - 5 \ \Rightarrow\ 9x = 72
  3. 3

    Divide both sides by 9:

    9x9=729 ⇒ x=8\frac{9x}{9} = \frac{72}{9} \ \Rightarrow\ x = 8
  4. 4

    Check: put x = 8 back into the equation.

    9⋅8+5=72+5=77✓9\cdot8 + 5 = 72 + 5 = 77 \checkmark
LaTeX source of the formulas on this page
\[ 9x + 5 = 77\ \Rightarrow\ x = 8 \]
\[ 9x + 5 = 77 \]
\[ 9x + 5 - 5 = 77 - 5 \ \Rightarrow\ 9x = 72 \]
\[ \frac{9x}{9} = \frac{72}{9} \ \Rightarrow\ x = 8 \]
\[ 9\cdot8 + 5 = 72 + 5 = 77 \checkmark \]

Trying values of x in 9x + 5 = 77

x9x + 5Equals 77?
659no
768no
877yes
986no
1095no

Questions

What is x in 9x + 5 = 77?

The solution of 9x + 5 = 77 is x = 8.

How do you solve 9x + 5 = 77?

Subtract 5 from both sides to get 9x = 72, then divide both sides by 9 to get x = 8.

How do I check the answer?

Replace x by 8: 9(8) + 5 = 77, which is 77.

Similar equations

    Solve 9x + 5 = 77: x = 8 (steps and check) | WordGPT