Question

me ajudem !!!

a)-2x-6y=6
x+7y=-3

b)5x-y=1
2y-3y=-10

c)x+8y=-14
2x-9y=-3

d)x+y=0
2y-y=6

e)x+y=-5
3x-3y=3

f)2y+2y=-6
-x-y=3

Answer 1

a) {-2x-6y=6
{x+7y=-3
x=-3-7y
-2(-3-7y)-6y=6
6+14y-6y=6
14y-6y=6-6
8y=0
y=0/8
y=0
x=-3-7y
x=-3-7.0
x=-3-0
x=-3
S={(-3, 0)}
b) {5x-y=1
{2y-3y=-10
5x-y=1.(-3)
{-15x+3y=-3
{2x-3y=-10
-13x=-13.(-1)
13x=13
x=13/13
x=1
5x-y=1
5.1-y=1
5-y=1
-y=1-5
-y=-4.(-1)
y=4
S={(1, 4)}
c) {x+8y=-14
{2x-9y=-3
x+8y=-14.(-2)
{-2x-16y=28
{2x-9y=-3
-25y=25.(-1)
25y=-25
y=-25/25
y=-1
x+8y=-14
x+8.(-1)=-14
x-8=-14
x=-14+8
x=-6
S={(-6, -1)}
d) {x+y=0
{2y-y=6
x=0-y
2.(0-y)-y=6
0-2y-y=6
-2y-y=6-0
-3y=-6.(-1)
3y=6
y=6/3
y=2
x+y=0
x+2=0
x=0-2
x=-2
S={(-2, 2)}
e) {x+y=-5
{3x-3y=3
x+y=-5.(3)
{3x+3y=-15
{3x-3y=3
6x=-12
x=-12/6
x=-2
x+y=-5
-2+y=-5
y=-5+2
y=-3
S={(-2, -3)}