Question

me ajudem gente pfv..preciso da resposta hj

Answer 1

$a) \left \{ {{3x + y=8} \atop {x + y=6} 3.(6-y) + 4 = 8 18 - 3y + y= 8 18 - 2y= 8 -2y =8-18 -2y= -10 .(-1) 2y= 10 y= 10/2 = 5 b) \left \{ {{2x+2y=13} \atop {5x-2y= 1}} \right. 7x=14 x= 14/7=2=2 5.2-2y=1 10-2y=1 -2y= 1-10 -2y =-9 .(-1) y= 9/2$