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Let me state an example:

There are two consecutive even numbers. The sum of the two consecutive even numbers is 20. If the difference of the two numbers is 2, find the numbers.

Let:

x-be first number

x+2-second number

x+y=20

x-y=2

We can pick any equation and find the value of either of the variables, but I will select the second equation instead.

x-y=2

x=y+2

x+y=20

since the value of x is y+2, substitute the value.

y+2+y=20

2y+2=20

2y=18

y=9

Substitute the value of y in the value of x

x=y+2

x=9+2

x=11.

Hope this helps =)

There are two consecutive even numbers. The sum of the two consecutive even numbers is 20. If the difference of the two numbers is 2, find the numbers.

Let:

x-be first number

x+2-second number

x+y=20

x-y=2

We can pick any equation and find the value of either of the variables, but I will select the second equation instead.

x-y=2

x=y+2

x+y=20

since the value of x is y+2, substitute the value.

y+2+y=20

2y+2=20

2y=18

y=9

Substitute the value of y in the value of x

x=y+2

x=9+2

x=11.

Hope this helps =)