Question

What statement makes the open sentence 12 + 3x = 30 true?

Answer 1

Okay, so the three x right? It means 3*x=y+12. So 30-12 is? 18, 18/3 is 6, so: 12+3*6=30.

Answer 2

x=6

Explanation:

We have the equation 12+3x=30, we need to calculate the value of x:

`12+3x=30`, subtract 12 in both sides

`12+3x-12=30-12`

`3x=18`, divide both sides in 3

`(3x)/(3)=(18)/(3)`

`x=6`

Now to see if this statement is true we have to replace in 12+3x=30 with x=6,

`12+3x=30\\12+3.6=30\\12+18=30\\30=30`

Then x=6 makes the sentence true.