Question

10. If 2x + y = 23 and 4x -y= 19. find the values of 5y- 2y and y/x-2​

Answer 1

Answer:

2x+y=23 -(i)

4x-y=19 -(ii)

Adding equation (i) and (ii)

2x+y+(4×-y)=23+19

=>2x + y + 4x - y=42

=>6x=42

=>x=42/6

=>x=7

putting the value of x in (i)

2×7+y=23

=>14+y=23

=>y=23-14=9

Now,

5y-2y=5×9-2×9=45-18= 27;

And

y/x-2=9/7-2=(9-14)/2= -5/2;

Answer 2

Step-by-step explanation:

2x + y =23

2x=23-y

x=23-y/2

4x-y=19

4x=19-y

x=19-y/4

Then....

5y-2y =3y

y=4

3y=3×4=12

Like that we can say....

y/x - 2

=y/x=0+2

=y=2x

=y=4-5/4×5

y= -1/20

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