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Solve 4x + 3 = 31

The solution of 4x + 3 = 31 is x = 7.

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The lines y = 4x + 3 and y = 31 meet at x = 724681012102030405060x = 7y = 4x + 3y = 31
The lines y = 4x + 3 and y = 31 meet at x = 7. 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.

    4x+3=314x + 3 = 31
  2. 2

    Subtract 3 from both sides:

    4x+3−3=31−3 ⇒ 4x=284x + 3 - 3 = 31 - 3 \ \Rightarrow\ 4x = 28
  3. 3

    Divide both sides by 4:

    4x4=284 ⇒ x=7\frac{4x}{4} = \frac{28}{4} \ \Rightarrow\ x = 7
  4. 4

    Check: put x = 7 back into the equation.

    4⋅7+3=28+3=31✓4\cdot7 + 3 = 28 + 3 = 31 \checkmark
LaTeX source of the formulas on this page
\[ 4x + 3 = 31\ \Rightarrow\ x = 7 \]
\[ 4x + 3 = 31 \]
\[ 4x + 3 - 3 = 31 - 3 \ \Rightarrow\ 4x = 28 \]
\[ \frac{4x}{4} = \frac{28}{4} \ \Rightarrow\ x = 7 \]
\[ 4\cdot7 + 3 = 28 + 3 = 31 \checkmark \]

Trying values of x in 4x + 3 = 31

x4x + 3Equals 31?
523no
627no
731yes
835no
939no

Questions

What is x in 4x + 3 = 31?

The solution of 4x + 3 = 31 is x = 7.

How do you solve 4x + 3 = 31?

Subtract 3 from both sides to get 4x = 28, then divide both sides by 4 to get x = 7.

How do I check the answer?

Replace x by 7: 4(7) + 3 = 31, which is 31.

Similar equations

    Solve 4x + 3 = 31: x = 7 (steps and check) | WordGPT