Question

considere a matiz igualdade

Answer 1

a+2b=4 ==>a+2(2a-6)=4 ==>5a =16 ==>a=16/5

2a-b=6 ==> b=2a-6 ==>b=32/5 -6 =2/5

2c+d=10 ==> 2 * (2d+2) +d=10 ==> 5d =6 ==>d=6/5

c-2d =2  ==> c=2d +2 =12/5 +2 =22/5