WordGPT

Solve 3x + 15 = 72

The solution of 3x + 15 = 72 is x = 19.

Explain it step by step in chatMake a short video of it
The lines y = 3x + 15 and y = 72 meet at x = 191416182022245560657075808590x = 19y = 3x + 15y = 72
The lines y = 3x + 15 and y = 72 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.

    3x+15=723x + 15 = 72
  2. 2

    Subtract 15 from both sides:

    3x+15−15=72−15 ⇒ 3x=573x + 15 - 15 = 72 - 15 \ \Rightarrow\ 3x = 57
  3. 3

    Divide both sides by 3:

    3x3=573 ⇒ x=19\frac{3x}{3} = \frac{57}{3} \ \Rightarrow\ x = 19
  4. 4

    Check: put x = 19 back into the equation.

    3⋅19+15=57+15=72✓3\cdot19 + 15 = 57 + 15 = 72 \checkmark
LaTeX source of the formulas on this page
\[ 3x + 15 = 72\ \Rightarrow\ x = 19 \]
\[ 3x + 15 = 72 \]
\[ 3x + 15 - 15 = 72 - 15 \ \Rightarrow\ 3x = 57 \]
\[ \frac{3x}{3} = \frac{57}{3} \ \Rightarrow\ x = 19 \]
\[ 3\cdot19 + 15 = 57 + 15 = 72 \checkmark \]

Trying values of x in 3x + 15 = 72

x3x + 15Equals 72?
1766no
1869no
1972yes
2075no
2178no

Questions

What is x in 3x + 15 = 72?

The solution of 3x + 15 = 72 is x = 19.

How do you solve 3x + 15 = 72?

Subtract 15 from both sides to get 3x = 57, then divide both sides by 3 to get x = 19.

How do I check the answer?

Replace x by 19: 3(19) + 15 = 72, which is 72.

Similar equations

    Solve 3x + 15 = 72: x = 19 (steps and check) | WordGPT