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5y=2
x+y=2 2/5
y=2/5
x+ 2/5 =2/5
y=2/5
x=0
B)
4y-x=6
17y=0
4y-x=6
y=0/17
4y-x=6
y=0
4*0-x=6
y=0
-x=6
y=0
x=-6
y=0
C)
a=b
2a+b=9
a=b
2b+b=9
a=b
3b=9
a=b
b=3
a=3
b=3
;)
5y=2
x+y=2 2/5
5y=2
y=2 2/5-x
5*((12/5)-x)=2
12-x=2
x=10
y=2 2/5-10
y=-7 3/5
b)
4y-x=6
17y=0
4y=6+x /:4
17y=0
y=6/4+1/4 x
17y=0
17(6/4+1/4 x)=0
102/4 + 17/4 x=0 /*4
102+17x=0
17x=-102
x-6
y=6/4 + (-6/4)
y=0
c)
a=b
2a+b=9
2b+b=9
3b=9
b=3
a=3
y=2:5=0,4
y+x=2 2/5
x=2 2/5-0,4=2
B)17y=0
y=17:0=0
4y-x=6
4*0-x=6
0-(-6)=6
C)a=b
2a+b=9
2a+a=9
3a=9
9:3=3
a=3
2*3+3=9