Rozwiąż równania:
a) x+3y=5
5x+y=11
b) 3x-2y=6
x+4y=16
c) x+2y=7
3x-y=14
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x=5-3y
5(5-3y)+y=11
25-15y+y=11
-14y=-14
y=1
x+3=5
x=2
y=1
b)3x-2y=6
x+4y=16 /*-3
3x-2y=6
-3x+-12y=-48
-14y=-42
y=3
x+4y=12
y=3
x=4
c)x=7-2y
3(7-2y)-y=14
21-6y-y=14
-7y=-7
y=1
x+2=7
x=5
y=1
5x+y=11
y=11-5x
x+3(11-5x)=5
x+33-15x=5
-14x+33=5
-14x= -28 /:(-14)
x=2
y=11-5*2=1
b)3x-2y=6
x+4y=16
x=16-4y
3(16-4y)-2y=6
48-12y-2y=6
48-14y=6
-14y= -42 /:(-14)
y=3
x=16-4*3=4
c)x+2y=7
3x-y=14
x=7-2y
3(7-2y)-y=14
21-6y-y=14
21-7y=14 /-21
-7y= -7 /:(-7)
y=1
x=7-2*1=5