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h) 2x-y=4
x+y=11
2x-y=4
x=11-y
2(11-y)-y=4
x=11-y
22-2y-y=4
x=11-y
-3y=-18
x=11-y
y=6
x=11-6
y=6
x=5
spr
2x-y=4
x+y=11
2*5-6=4
6+5=11
10-6=4
11=11
4=4
i) x-2y=-3
2x+3y=8
x=2y-3
2(2y-3) +3y=8
x=2y-3
4y-6+3y=8
x=2y-3
7y=14
x=2y-3
y=2
x= 4-3
y=2
x=1
y=2
x-2y=-3
2x+3y=8
1-4=-3
2+6=8
-3=-3
8=8
2
g) -2x+5y=-10 /*7
7x-4y=8 /*2
-14x+35y=-70
14x-8y=16
_________
27y=-54
y=-2
7x-4y=8
7x-4*(-2) = 8
7x+8=8
7x=0
x=0
x=0
y=-2
spr
-2x+5y=-10
7x-4y=8
-10=-10
8=8
h) 9x+8y=1 /*(-5)
5x-6y=11 /*9
-45x-40y=-5
45x-54y=99
__________
-94y=94
y=-1
5x-6y=11
5x+6=11
5x=5
x=1
x=1
y=-1
spr
9x+8y=1
5x-6y=11
9-8=1
5+6=11
1=1
11=11
x=11-y
2(11-y)-y=4
22-2y-y=4
-3y=-18/ : -3
y=6
x=11-6
x=5
i)x=-3+2y
2x+3y=8
2(-3+2y) + 3y=8
-6+4y+3y=8
7y=14/:7
y=2
2x+3*2=8
2x+6=8
2x=2/:2
x=1