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Solve 5x + 8 = 3

The solution of 5x + 8 = 3 is x = -1.

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The lines y = 5x + 8 and y = 3 meet at x = -1-6-4-224-30-20-10102030x = -1y = 5x + 8y = 3
The lines y = 5x + 8 and y = 3 meet at x = -1. 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.

    5x+8=35x + 8 = 3
  2. 2

    Subtract 8 from both sides:

    5x+8−8=3−8 ⇒ 5x=−55x + 8 - 8 = 3 - 8 \ \Rightarrow\ 5x = -5
  3. 3

    Divide both sides by 5:

    5x5=−55 ⇒ x=−1\frac{5x}{5} = \frac{-5}{5} \ \Rightarrow\ x = -1
  4. 4

    Check: put x = -1 back into the equation.

    5⋅(−1)+8=−5+8=3✓5\cdot(-1) + 8 = -5 + 8 = 3 \checkmark
LaTeX source of the formulas on this page
\[ 5x + 8 = 3\ \Rightarrow\ x = -1 \]
\[ 5x + 8 = 3 \]
\[ 5x + 8 - 8 = 3 - 8 \ \Rightarrow\ 5x = -5 \]
\[ \frac{5x}{5} = \frac{-5}{5} \ \Rightarrow\ x = -1 \]
\[ 5\cdot(-1) + 8 = -5 + 8 = 3 \checkmark \]

Trying values of x in 5x + 8 = 3

x5x + 8Equals 3?
-3-7no
-2-2no
-13yes
08no
113no

Questions

What is x in 5x + 8 = 3?

The solution of 5x + 8 = 3 is x = -1.

How do you solve 5x + 8 = 3?

Subtract 8 from both sides to get 5x = -5, then divide both sides by 5 to get x = -1.

How do I check the answer?

Replace x by -1: 5(-1) + 8 = 3, which is 3.

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    Solve 5x + 8 = 3: x = -1 (steps and check) | WordGPT