помогите матем уравнения с подставкой. Created by дикий566656566675. matematika-ru

помогите матем уравнения с подставкой...

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1) x = 3 + y => 4(3+y)+3y = 5
12+4y+3y = 5
7y = -7
y = -1 => x = 3-1 = 2
(2, -1)

2) x = 7+y => 5(7+y)-3y = 1
35+5y-3y = 1
2y = -34
y = -17 => x = 7-17 = -10
(-10, -17)

3) y = -2-2x => 6x+5(-2-2x) = 6
6x-10-10x = 6
-4x = 16
x = -4 => y = -2+8 = 6
(-4, 6)

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miki68

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4х+3у=5 х=7+у 6х+5у=6
х=3+у 5х-3у=1 у=-2-2х

4*(3+у)+3у=5 х=7+у 6х+5*(-2-2х)=6
х=3+у 5*(7+у)-3у=1 у=-2-2х

12+4у+3у=5 х=7+у 6х-10-10х=6
х=3+у 35+5у-3у=1 у=-2-2х

12+7у=5 х=7+у -4х-10=6
х=3+у 35+2у=1 у=-2-2х

7у=-7 х=7+у -4х=16
х=3+у 2у=-34 у=-2-2х

у=-1 х=7+(-17) х=-4
х=3+(-1) у=-17 у=-2-2*(-4)

у=-1 х=-10 х=-4
х=2 у=-17 у=6

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