Question

решить систему ленейных уровненений способ подстановки

Answer 1

1) $left { {{4x+3y=2} atop {x-4y=-9}} right. left { {{4(4y-9)+3y=2} atop {x=4y-9}} right. left { {{x=4y-9} atop {16y-36+3y=2}} right. left { {{x=4y-9} atop {19y=38}} right. left { {{x=4*2-9} atop {y=2}} right. left { {{x=-1} atop {y=2}} right.$

2)  $left { {{3x-2y=16} atop {x+4y=-4}} right. left { {{3(-4-4y)-2y=16} atop {x=-4-4y}} right. left { {{x=-4-4y} atop {-12-12y-2y=16}} right. left { {{x=-4-4y} atop {-14y=28}} right. left { {{x=-4-4*(-2)} atop {y=-2}} right.$$left { {{x=4} atop {y=-2}} right.$