Răspuns:
Explicație pas cu pas:
2(4x + 5y - 8) = 5(2x + 3y - 7)
8x + 10y - 16 = 10x + 15y - 35
10x - 8x + 15y - 10y = 35 - 16
2x + 5y = 19
_________
3(5x - 4y + 10) = 4(3x - 2y + 6)
15x - 12y + 30 = 12x - 8y + 24
15x - 12x - 12y + 8y = 24 - 30
3x - 4y = -6
___________
2x + 5y = 19 (*4)
3x - 4y = -6 (*5)
8x + 20y = 76
15x - 20y = -30
8x + 15x + 20y - 10y = 76 - 30
23x = 46
x = 46 : 2 = 2
4 + 5y = 19
5y = 19 - 4 = 15
y = 15 : 5 = 3
____________
x = 2; y = 3
