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Solve 4x + 15 = 79

The solution of 4x + 15 = 79 is x = 16.

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The lines y = 4x + 15 and y = 79 meet at x = 161012141618202260708090100x = 16y = 4x + 15y = 79
The lines y = 4x + 15 and y = 79 meet at x = 16. 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+15=794x + 15 = 79
  2. 2

    Subtract 15 from both sides:

    4x+15−15=79−15 ⇒ 4x=644x + 15 - 15 = 79 - 15 \ \Rightarrow\ 4x = 64
  3. 3

    Divide both sides by 4:

    4x4=644 ⇒ x=16\frac{4x}{4} = \frac{64}{4} \ \Rightarrow\ x = 16
  4. 4

    Check: put x = 16 back into the equation.

    4⋅16+15=64+15=79✓4\cdot16 + 15 = 64 + 15 = 79 \checkmark
LaTeX source of the formulas on this page
\[ 4x + 15 = 79\ \Rightarrow\ x = 16 \]
\[ 4x + 15 = 79 \]
\[ 4x + 15 - 15 = 79 - 15 \ \Rightarrow\ 4x = 64 \]
\[ \frac{4x}{4} = \frac{64}{4} \ \Rightarrow\ x = 16 \]
\[ 4\cdot16 + 15 = 64 + 15 = 79 \checkmark \]

Trying values of x in 4x + 15 = 79

x4x + 15Equals 79?
1471no
1575no
1679yes
1783no
1887no

Questions

What is x in 4x + 15 = 79?

The solution of 4x + 15 = 79 is x = 16.

How do you solve 4x + 15 = 79?

Subtract 15 from both sides to get 4x = 64, then divide both sides by 4 to get x = 16.

How do I check the answer?

Replace x by 16: 4(16) + 15 = 79, which is 79.

Similar equations

    Solve 4x + 15 = 79: x = 16 (steps and check) | WordGPT