Question

9. 2x – 3y = 21
y=3-x

Answer 1

Answer: (6,-3)

Explanation:

(1) 2 x-3y=21

(2) y = 3 − x

Substituting eq 2 in eq 1

2 x − 3 ( 3-x)=21

2 x-9+3x=21

5 x − 9 = 21

5 x = 30

x = 6

Put x= 6 in eq 2 we get,

y =3 − 6

y = − 3

Solution : ( 6 , − 3 )