Question

4,7х-(0,5х+2у) если 2,1х-у=-3
СРООЧНО!!!

Answer 1

2,1x-y=-3
y=2,1x+3

4,7x-(0,5x+2*(2,1x+3)) = 4,7x-(0,5x+4,2x+6) = 4,7x-4,7x-6=-6