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3x + y = 4 +
5x = 5
x = 1 ⇒⇒ 2x - y = 1
y = 1 ⇔⇔ 2 - y = 1
3. 2x + y = 1
2x - y = 2 +
4x = 3 2x - y = 2 ⇒⇒⇒ 3/2 - y = 2
x = 3/4 y = -1/2
5. 2x - 4y = 6
2x - 2y = 4 _
-2y = 2
y = -1
2x - 2y = 4
2x + 2 = 4
x = 1
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