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natka813 [3]
3 years ago
12

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

Mathematics
2 answers:
Mamont248 [21]3 years ago
8 0

Answer:

See below.

Step-by-step explanation:

We can solve for x:

−3(x+8) = −21

Distribute the -3 over the parentheses:

-3x - 24 = -21

Add 24 to both sides:

-3x -24 + 24 = -21 + 24

-3x = 3

Divide both sides by -3:

x = -1.

So that proves the original equation.

Zigmanuir [339]3 years ago
4 0

Answer:

Yes, this is true.

Step-by-step explanation:

If you substitue x for -1 you get -3(-1+8)=-21, Then you add -1 and 8 so you should get 7. After, you multiply 7 times -3 you get -21. Proving this statement is correct.

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