1) 2x+8y=20
y=2
2x+8(2)=20
2) x=5
2x+y=10
2(5)+y=10
...
Mathematics, 01.12.2019 23:31 ronaldo22
1) 2x+8y=20
y=2
2x+8(2)=20
2) x=5
2x+y=10
2(5)+y=10
3) 5x-2y=3
y=2x
5x-2(2x)=3
4) 2y+x=-15
x=3y
2y+(3x)=-15
5) 4x+7y=19
y=x+9
4x+7(x+9)=19
6)y=6x+11
2y-4x+14
2(6x+11)-4x+14
7)2x-8y=6
y=-7-x
2x-8(-7-x)=6
8) x=2y-1
3x-2y=-3
3(2y-1)-2y=-3
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