1 Answer

Mike Lewis · Answer 1 · 2019-09-21T16:13:05+0000

3x - y = 6 ------------ (1)
y = x - 4 ------------ (2)

From (1) + (2) :
( 3x - y) + y = 6 + (x - 4)
3x - y + y = 6 + x - 4
3x = x + 2
2x = 2
x = 1 ------------- Sub into (2)

y = x - 4
y = 1 - 4
y = -3

Answer: x = 1, y = -3

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