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Complete Explanation with solutions

1.) x + 2
2.) a - 1 = 9

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ANSWER :

1.) x = -2

2.) a = 10

SOLUTION :

1.) x + 2

  • Add Equal to 0 in order.

x + 2 = 0

  • Move constant to the right by adding its opposite to both sides.

x + 2 - 2 = 0 - 2

  • Note : since two opposites add up to zero, remove them from the expression.

x = 0 - 2

  • Note : when adding or subtracting 0, the quantity does not change.

x = - 2

2.) a - 1 = 9

  • Move constant to the right-hand side and change its sign.

a = 9 + 1

a = 10

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