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Solve 8x + 5 = 85

The solution of 8x + 5 = 85 is x = 10.

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The lines y = 8x + 5 and y = 85 meet at x = 1046810121416406080100120140x = 10y = 8x + 5y = 85
The lines y = 8x + 5 and y = 85 meet at x = 10. 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.

    8x+5=858x + 5 = 85
  2. 2

    Subtract 5 from both sides:

    8x+5−5=85−5 ⇒ 8x=808x + 5 - 5 = 85 - 5 \ \Rightarrow\ 8x = 80
  3. 3

    Divide both sides by 8:

    8x8=808 ⇒ x=10\frac{8x}{8} = \frac{80}{8} \ \Rightarrow\ x = 10
  4. 4

    Check: put x = 10 back into the equation.

    8⋅10+5=80+5=85✓8\cdot10 + 5 = 80 + 5 = 85 \checkmark
LaTeX source of the formulas on this page
\[ 8x + 5 = 85\ \Rightarrow\ x = 10 \]
\[ 8x + 5 = 85 \]
\[ 8x + 5 - 5 = 85 - 5 \ \Rightarrow\ 8x = 80 \]
\[ \frac{8x}{8} = \frac{80}{8} \ \Rightarrow\ x = 10 \]
\[ 8\cdot10 + 5 = 80 + 5 = 85 \checkmark \]

Trying values of x in 8x + 5 = 85

x8x + 5Equals 85?
869no
977no
1085yes
1193no
12101no

Questions

What is x in 8x + 5 = 85?

The solution of 8x + 5 = 85 is x = 10.

How do you solve 8x + 5 = 85?

Subtract 5 from both sides to get 8x = 80, then divide both sides by 8 to get x = 10.

How do I check the answer?

Replace x by 10: 8(10) + 5 = 85, which is 85.

Similar equations

    Solve 8x + 5 = 85: x = 10 (steps and check) | WordGPT