Drag a statement or reason to each box to complete this proof. if −3(x+8)=−21, then x=−1.

Yes, it's true. X=-1

Step-by-step explanation:

We have,

The objective is to discover which is the value of x, then first we need to divide both sides of the equation in -3,

Now we can simplify and the result is,

Because and

Then we have to sum (-8) in both sides of the equation,

And we have:

answer: bea's uncle is 25 years old.

step-by-step explanation:

given the equation , we can say that the variable "x" represents the age of bea's uncle. then to find his age, we need to solve for "x":

we must add 15 to both sides of the equation:

now we need to divide both sides of the equation by 3:

therefore, we can conclude that bea's uncle is 25 years old.