Răspuns:
Explicație pas cu pas:
a)
3x + 3y + 3 - 2x + 10 + 2y = 24
-10x - 15y + 20 + 4 + 12x + 8y = 12
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x + 5y + 13 = 24
2x - 7y + 24 = 12
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x + 5y = 24 - 13 = 11
2x - 7y = 12 - 24 = -12
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x = 11 - 5y
2(11 - 5y) - 7y = -12
22 - 10y - 7y = -12
22 - 17y = -12
17y = 22 + 12
17y = 34
y = 34 : 17 = 2
x = 11 - 5*2 = 11 - 10 = 1
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b)
2 - 2x - 2y - 8x + 4y = -34
14x + 7y + 21 + 5x + 10y + 5 = 32
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-10x + 2y = -34 - 2 = -36
19x + 17y + 26 = 32
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-5x + y = -18
19x + 17y = 32 - 26 = 6
--------
y = 5x - 18
19x + 17(5x - 18) = 6
19x + 85x - 306 = 6
104x = 306 + 6 = 312
x = 312 : 104 = 3
y = 5*3 - 18 = 15 - 18 = -3
