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2x -2y = 7 /*(-2)
4x + 3y = 21
-4x + 4y = -14
4x + 3y = 21
----------------
7y = 7 /:7
y = 1
4x + 3y = 21
4x + 3 *1 = 21
4x = 21 - 3
4x = 18 /:4
x = 18/4
x = 4 2/4
x = 4 1/2
x = 4 1/2
y = 1
b)
2x + 3y = 14 /* 2
3x - 2y = 8 /* 3
4x + 6y = 28
9x - 6y = 24
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13x = 52 /:13
x = 4
2x + 3y = 14
2* 4 + 3y = 14
8 + 3y = 14
3y = 14 - 8
3y = 6 /:3
y = 2
x = 4
y = 2