Patrick B. answered 01/01/19
Math and computer tutor/teacher
3x+y = x+3
x-2y = y-2
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2x + y = 3 <--- subtracts x from both sides in first equation
x-3y = -2 <--- subtracts y from both sides in second equation
x = 3y-2 <--- solves second equation for x; please label this equation ALPHA
2(3y-2) + y = 3 <--- substitutes into first equation
6y - 4 + y = 3 <--- distributive
7y - 4 = 3 <--- combines like terms
7y = 7 <--- adds 4 to both sides
y=1 <-- divides both sides by 7
x = 3y-2 = 3(1)-2 = 3-2 = 1 <--- substitutes into equation ALPHA in bold above.
(1,1) is one solution