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2x + y = 4
x - y = 5
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3x = 9 /:3
x = 3
x - y = 5
3 - y = 5
y = 3 - 5
y = -2
x = 3
y = -2
c)
3x - y = -8 /*(-2)
x - 2y = -6
-6x + 2y = 16
x - 2y = -6
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-5x = 10 /:(-5)
x = -2
x - 2y = -6
-2 - 2y = -6
-2y = -6 + 2
-2y = -4 /:(-2)
y = 2
x = -2
y = 2
d)
2x + 3y = 5
3x - y = 13 /*3
2x + 3y = 5
9x - 3y = 39
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11x = 44 /:11
x = 4
3x - y = 13
12 - y = 13
y = 12 - 13
y = -1
x = 4
y = -1