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Sagot :

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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