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Solve 3x + 8 = 5

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

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The lines y = 3x + 8 and y = 5 meet at x = -1-6-4-224-15-10-5510152025x = -1y = 3x + 8y = 5
The lines y = 3x + 8 and y = 5 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.

    3x+8=53x + 8 = 5
  2. 2

    Subtract 8 from both sides:

    3x+8−8=5−8 ⇒ 3x=−33x + 8 - 8 = 5 - 8 \ \Rightarrow\ 3x = -3
  3. 3

    Divide both sides by 3:

    3x3=−33 ⇒ x=−1\frac{3x}{3} = \frac{-3}{3} \ \Rightarrow\ x = -1
  4. 4

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

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

Trying values of x in 3x + 8 = 5

x3x + 8Equals 5?
-3-1no
-22no
-15yes
08no
111no

Questions

What is x in 3x + 8 = 5?

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

How do you solve 3x + 8 = 5?

Subtract 8 from both sides to get 3x = -3, then divide both sides by 3 to get x = -1.

How do I check the answer?

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

Similar equations

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