Question

5
(i) x + y = 4; 2x - 5y = 1
(iii) 3x - 5y=16; x-3y=8
(v) 2x + 3y+4= 0; x- 5y = 11​

Answer 1

1) y=1,x=3

2)y=-2,x=2

3)x=-1,y=-2

Answer 2

(1) x+y=4 ___(1), 2x−5y=1__(2)

multiply eq. (1) by 2.

and then subtract eq. (2)

2x+2y=8

2x−5y=1

- + -

____________

7y=7

y=1

x+y=4

x+1=4

x=3

(2) x−3y=8)×3

⇒3x−9y=24

(-)3x-5y=16

________

-4y=8 ⇒y=−2

x−3y=8⇒x=3y+8=−6+8=2⇒x=2

third number question answer in the image