a)
0,4x + 0,3 y = 1,4 /*10
0,1x + 3y = 2,3 /*10
4x + 3y = 14
x +30y = 23 /*(-4)
4x + 3y = 14
-4x – 120y = -92
----------------------
- 117y = - 78 /: (-117)
y = 78/117
y = 26/39
4x + 3 *26/39 = 14
4x = 14 - 2
4x = 12 /:4
x = 3
y = 26/39
b)
2x + 3y = 14
3x – 2y = 8 /* 1,5
2x + 3y = 14
4,5x -3y = 12
-------------------
6,5x = 26 /: 6,5
x = 4
2*4 + 3y = 14
3y = 14 – 8
3y = 6 /:3
y = 2
x = 4
y = 2
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