Answer:
1. Let x = the first number
2 + x = the second number
equation: x + (2+ x ) = 40
---- 2x + 2 = 40
---- 2x = 40 - 2
---- 2x = 38
(divide both side by 2 to get the value of x)
---- x = 19
2 + x = 21
the first number = 19
the second number = 21
3. Let x = the first number
x - 10 = the second number
equation: x + (x - 10) = 12
---- 2x - 10 = 12
---- 2x = 12 + 10
---- 2x = 22
(divide both side by 2 to get the value of x)
---- x = 11
x - 10 = 1
the first number = 57
the second number = 45
3. Let x = the first number
x - 12 = the second number
equation: x + (x - 12) = 102
---- 2x - 12 = 102
---- 2x = 102 + 12
---- 2x = 114
(divide both side by 2 to get the value of x)
---- x = 57
x - 12 = 45
the first number = 57
the second number = 45
4. (in the picture)
5. (in the picture)
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