Question

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Answer 1

a){x+y=3
{3x+y=1
x+y=3
x=3-y
3x+y=1
3(3-y)+y=1
9-3y+y=1
-3y+y=1-9
-2y=-8
y=-8/-2
y=4
x=3-y
x=3-4
x=-1

b){x+2y=12
{3x-y=22
x+2y=12
x=12-2y
3x-y=22
3(12-2y)-y=22
36-6y-y=22
-6y-y=22-36
-7y=-14
y=-14/-7
y=2
x=13-2y
x=13-2.2
x=13-4
x=9

c){-2x-6y=6
{x+7y=-3
x+7y=-3
x=-3-7y
-2x-6y=6
-2(-3-7y)-6y=6
6+14y-6y=6
14y-6y=6-6
8y=0
y=0/8
y=8
x=-3-7y
x=-3-7.8
x=-3-56
x=-59

d){5x-y=1
{2x-3y=-10
5x-y=1(-1)
-5x+y=-1
y=-1+5x
2x-3y=-10
2x-3(-1+5x)=-10
2x+3-15x=-10
2x-15x=-10-3
-13x=-13
x=-13/-13
x=1
y=-1+5x
y=-1+5.1
y=-1+5
y=4


e){x+8y=-14
{2x-9y=-3
x+8y=-14
x=-14-8y
2x-9y=-3
2(-14-8y)-9y=-3
-28-16y-9y=-3
-16y-9y=-3+28
-25y=25
y=25/-25
y=-1
x=-14-8y
x=-14-8.(-1)
x=-14+8
x=-6