Question

1.

5y - x=3

x=3 - y

2.

4y - x =6

17y=o

3.

a=b

2a + b=9

4.

u=4v

5u - v=10

5.

3r=s

3r +s=24

Answer 1

1.

5y - x=3

x=3 - y

 

5y-(3-y)=3

5y-3+y=3

6y-3=3|+3

6y=9|/6

y=1,5

x=3-1,5=1,5

 

2.

4y - x =6

17y=0

 

17y=0|/17

y=0

4*0-x=6

-x=6|* -1

x=-6

 

3.

a=b

2a + b=9

3a=9 | /3

a=3

b=3

 

4.

u=4v

5u - v=10

5*4v-v=10

20v-v=10

19v=10 | /19

v=10/19

u=10/19*4=40/19=2 i 2/19

 

5.

3r=s

3r +s=24

 

3r+3r=24

6r=24 |6

r=4

s=3*4=12

Answer 2

1.

5y-x=3

x=3-y

 

5y-(3-y)=3

5y-3+y=3

6y=3+3

6y=6  //:6

y=1

 

x=3-y

x=3-1

x=2

 

2.

4y - x =6

17y=o

y=0/17

y=0

 

4*0-x=6

0-x=6

-x=6

x=-6

 

3.

a=b

2a + b=9

 

2b+b=9

3b=9  //:3

b=3

 

a=b

a=3

 

4.

u=4v

5u - v=10

5*4v-v=10

20v-v=10

19v=10  //19

v=10/19

 

u=4v

u=2* 10/19

u=20/19

 

5.

3r=s

3r +s=24

3r+3r=24

6r=24 //6

r=4

 

s=3r

s=3*4

s=12