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4x - y = 5
4x - y = 5
4x - 5 = y
3x + y = 2
3x + 4x - 5 = 2
7x = 7
x = 1
4x - 5 = y
4 - 5 = y
- 1 = y
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3x - 2y = - 1
6x + 3y = 5
3x - 2y = - 1
3x + 1 = 2y
6x + 3y = 5
6x + y + 3x + 1 = 5
9x + y = 4
y = 4 - 9x
6x + 3y = 5
6x + 3(4 - 9x) = 5
6x + 12 - 27x = 5
7 = 21x
1/3 = x
y = 4 - 9x
y = 4 - 3
y = 1