Răspuns:
Explicație pas cu pas:
x + y = 8
y + 2z = 35
__________
a)
5x + 5y = 40
8y + 16z = 280
5x + 13y + 16z = 40 + 280 = 320
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b)
2x + 2y = 16
5y + 10z = 175
5y + 10z - 2x - 2y = 175 - 16
3y - 2x + 10x = 159
______________
c)
7x + 7y = 56
3y + 6z = 105
7x + 10y + 6z = 56 + 105 = 161
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d)
4×(2z+y)+3x+3y = 4×(2z+y)+3(x+y) = 4×35 + 3×8 = 140 + 24 = 164