Question

Решить систему уравнений:

x+3y=9

3x+5y=19

Answer 1

$left { {{x+3y=9} atop {3x+5y=19}} right. left { {{x=9-3y} atop {3(9-3y)+5y=19}} right. left { {{x=9-3y} atop {27-9y+5y=19}} right. left { {{x=9-3y} atop {-4y=-8}} right. left { {{x=9-3y} atop {y=2}} right. left { {{x=3} atop {y=2}} right.$