Question

3x+4/y=-1 and 4x+7/y=2 solve equations​

Answer 1

Step-by-step explanation:

let 1/y = u

the given can be written as

3x+4u=-1............eq1

and

4x+7u=2...........eq2

by multiplying eq1 by 7 and eq2 by 4

21x+28u=-7.........eq3

16x+28u=8............eq4

subtracting eq4 from eq3 we get

5x=-15

x=-15/5

x=-3

putting the value of x in eq1

3×-3+4u=-1

-9+4u=-1

4u=-1+9

4u=8

u=8/4

u=2

u=1/y

1/y=2

y=1/2