Question

4x+y=3 решить методом подстановки
6x-2y=1

Answer 1

2у= 6х-1
у = 3-4х, 2у = 6-8х
6х-1 = 6-8х, 6х-1-6+8х = 0
14х-7 = 0
14х = 7, х = 1/2
4*1/2 + у = 3, 2+у=3, у = 1

Answer 2

$left { {{4x+y=3/*2} atop {6x-2y=1}} right. \ \ left { {{8x+2y=6} atop {6x-2y=1}} right. \ 14x=7\x=7/14\x=0.5\2+y=3\y=1 \ \ left { {{y=1} atop {x=0.5}} right.$