SOLUTION: The sum of 8 and a certain number is equal to the product of the number and 3.find the number

Question 1187204: The sum of 8 and a certain number is equal to the product of the number and 3.find the number
Found 2 solutions by ikleyn, math_tutor2020:
Answer by ikleyn(52777) (Show Source): You can put this solution on YOUR website!
.

8 + x = 3x 8 = 3x - x 8 = 2x x = 8/2 = 4. ANSWER. The number is 4.

Solved.

Answer by math_tutor2020(3816) (Show Source): You can put this solution on YOUR website!

x = unknown number
x+8 = sum of the number and 8
3x = product of the number and 3

Those two mentioned expressions are equal to one another
x+8 = 3x
8 = 3x-x
8 = 2x
2x = 8
x = 8/2
x = 4 is the unknown number

In the second step, I subtracted x from both sides. A bit afterward, I divided both sides by 2 so I can isolate x.

Check:
x+8 = 4+8 = 12
3x = 3*4 = 12
Both sides get us the same value, so we've shown that x = 4 is the solution to x+8 = 3x

Answer: 4

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