Question

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Answer 1

Answer:

n=4

Step-by-step explanation:

(7+1)+n=(4+7)+1

7+1+n=4+7+1 (subtract 7 from both sides)

1+n=4+1

1+n=5

n=5-1 (Subtract 1 from both sides)

n=4

Answer 2

Answer:

  n = 4

Step-by-step explanation:

Actually, in this problem, you can compare the numbers on the right to the numbers on the left and see that n must be 4 to make the lists match. (It's a problem in pattern matching.)

If you need to, you can rearrange the numbers:

  (7 + 1) + n = (7 + 1) + 4

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If that doesn't work for you, you can add up the numbers on each side and form the equation ...

  8 + n = 12

In second-grade terms, this is ...

 8 + ___ = 12

Hopefully, you are sufficiently familiar with your math facts to know that 4 will complete this math fact.

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If that doesn't work for you, then invoke the addition property of equality and add -8 to both sides of the equation.

  8 -8 +n = 12 -8

  n = 4