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Solve 5x + 4 = 79

The solution of 5x + 4 = 79 is x = 15.

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The lines y = 5x + 4 and y = 79 meet at x = 151012141618205060708090100110x = 15y = 5x + 4y = 79
The lines y = 5x + 4 and y = 79 meet at x = 15. 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+4=795x + 4 = 79
  2. 2

    Subtract 4 from both sides:

    5x+4−4=79−4 ⇒ 5x=755x + 4 - 4 = 79 - 4 \ \Rightarrow\ 5x = 75
  3. 3

    Divide both sides by 5:

    5x5=755 ⇒ x=15\frac{5x}{5} = \frac{75}{5} \ \Rightarrow\ x = 15
  4. 4

    Check: put x = 15 back into the equation.

    5⋅15+4=75+4=79✓5\cdot15 + 4 = 75 + 4 = 79 \checkmark
LaTeX source of the formulas on this page
\[ 5x + 4 = 79\ \Rightarrow\ x = 15 \]
\[ 5x + 4 = 79 \]
\[ 5x + 4 - 4 = 79 - 4 \ \Rightarrow\ 5x = 75 \]
\[ \frac{5x}{5} = \frac{75}{5} \ \Rightarrow\ x = 15 \]
\[ 5\cdot15 + 4 = 75 + 4 = 79 \checkmark \]

Trying values of x in 5x + 4 = 79

x5x + 4Equals 79?
1369no
1474no
1579yes
1684no
1789no

Questions

What is x in 5x + 4 = 79?

The solution of 5x + 4 = 79 is x = 15.

How do you solve 5x + 4 = 79?

Subtract 4 from both sides to get 5x = 75, then divide both sides by 5 to get x = 15.

How do I check the answer?

Replace x by 15: 5(15) + 4 = 79, which is 79.

Similar equations

    Solve 5x + 4 = 79: x = 15 (steps and check) | WordGPT