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Solve 9x + 4 = 85

The solution of 9x + 4 = 85 is x = 9.

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The lines y = 9x + 4 and y = 85 meet at x = 946810121420406080100120140x = 9y = 9x + 4y = 85
The lines y = 9x + 4 and y = 85 meet at x = 9. 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+4=859x + 4 = 85
  2. 2

    Subtract 4 from both sides:

    9x+4−4=85−4 ⇒ 9x=819x + 4 - 4 = 85 - 4 \ \Rightarrow\ 9x = 81
  3. 3

    Divide both sides by 9:

    9x9=819 ⇒ x=9\frac{9x}{9} = \frac{81}{9} \ \Rightarrow\ x = 9
  4. 4

    Check: put x = 9 back into the equation.

    9⋅9+4=81+4=85✓9\cdot9 + 4 = 81 + 4 = 85 \checkmark
LaTeX source of the formulas on this page
\[ 9x + 4 = 85\ \Rightarrow\ x = 9 \]
\[ 9x + 4 = 85 \]
\[ 9x + 4 - 4 = 85 - 4 \ \Rightarrow\ 9x = 81 \]
\[ \frac{9x}{9} = \frac{81}{9} \ \Rightarrow\ x = 9 \]
\[ 9\cdot9 + 4 = 81 + 4 = 85 \checkmark \]

Trying values of x in 9x + 4 = 85

x9x + 4Equals 85?
767no
876no
985yes
1094no
11103no

Questions

What is x in 9x + 4 = 85?

The solution of 9x + 4 = 85 is x = 9.

How do you solve 9x + 4 = 85?

Subtract 4 from both sides to get 9x = 81, then divide both sides by 9 to get x = 9.

How do I check the answer?

Replace x by 9: 9(9) + 4 = 85, which is 85.

Similar equations

    Solve 9x + 4 = 85: x = 9 (steps and check) | WordGPT