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Hi,

x+5y=20 and x-y=2

Solving for x in terms of y using second equation

x-y = 2

x = y + 2

Substituting for x in the first equation:

x + 5y = 20

(y+2) + 5y = 20

6y + 2 = 20

6y = 18

y = 3 and x = 5 (3+2)

checking our answer

5 + 5*3 = 20