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Solve 4x + 4 = 80

The solution of 4x + 4 = 80 is x = 19.

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The lines y = 4x + 4 and y = 80 meet at x = 1914161820222460708090100x = 19y = 4x + 4y = 80
The lines y = 4x + 4 and y = 80 meet at x = 19. 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+4=804x + 4 = 80
  2. 2

    Subtract 4 from both sides:

    4x+4−4=80−4 ⇒ 4x=764x + 4 - 4 = 80 - 4 \ \Rightarrow\ 4x = 76
  3. 3

    Divide both sides by 4:

    4x4=764 ⇒ x=19\frac{4x}{4} = \frac{76}{4} \ \Rightarrow\ x = 19
  4. 4

    Check: put x = 19 back into the equation.

    4⋅19+4=76+4=80✓4\cdot19 + 4 = 76 + 4 = 80 \checkmark
LaTeX source of the formulas on this page
\[ 4x + 4 = 80\ \Rightarrow\ x = 19 \]
\[ 4x + 4 = 80 \]
\[ 4x + 4 - 4 = 80 - 4 \ \Rightarrow\ 4x = 76 \]
\[ \frac{4x}{4} = \frac{76}{4} \ \Rightarrow\ x = 19 \]
\[ 4\cdot19 + 4 = 76 + 4 = 80 \checkmark \]

Trying values of x in 4x + 4 = 80

x4x + 4Equals 80?
1772no
1876no
1980yes
2084no
2188no

Questions

What is x in 4x + 4 = 80?

The solution of 4x + 4 = 80 is x = 19.

How do you solve 4x + 4 = 80?

Subtract 4 from both sides to get 4x = 76, then divide both sides by 4 to get x = 19.

How do I check the answer?

Replace x by 19: 4(19) + 4 = 80, which is 80.

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    Solve 4x + 4 = 80: x = 19 (steps and check) | WordGPT