rozwiąż metodą PODSTAWIANIA
a) 2x-y=4
x+2y=7
b) 3x+4= -1
4x+3y=2
c) 4y+2x=10
3x+8y=10
d) 5x-4= 1,5
3x+6y= 4,2
e) 4x+2y=10
y=1-x
f) 3x+9y=21
5x+8y=17
g) 3x+y=11
2x+y=2
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a) 2x-y=4
x+2y=7
2x-y=4
x=7-2y
2(7-2y)-y=4
x=7-2y
14-4y-y=4
x=7-2y
-5y=-10
x=7-2y
y=2
x=7-2*2
y=2
x=3
b)3x+4=-1
4x+3y=2
3x=-5
4x+3y=2
x=-5/3
20/3+3y=2
x=-5/3
3y=2-20/3
x=-5/3
3y=-14/3
x=-5/3
y=-14
c)4y+2x=10
3x+8y=10
2x=10-4y
3x+8y=10
x=5-2y
3(5-2y)+8y=10
x=5-2y
15-6y+8y=10
x=5-2y
2y=-5
x=5-2y
y=-5/2
x=0
y=-5/2
d)5x=5,5
3x+6y=4,2
x=1,1
3,3+6y=4,2
x=1,1
6y=0,9
x=1,1
y=0,15
e)4x+2(1-x)=10
y=1-x
4x+2-2x=10
y=1-x
2x=8
y=1-x
x=4
y=-3
f)3x=21-9y
5x+8y=17
x=7-3y
5(7-3y)+8y=17
x=7-3y
35-15y+8y=17
x=7-3y
-7y=-18
x=7-3y
y=-18/7
x=7-3*-18/7
y=-18/7
x=-5/7
y=-18/7
g) y=11-3x
2x+11-3x=2
y=11-3x
-x=-9
y=11-3x
x=9
y=11-27
x=9
x=9
y=-26