Question

1. 11x + 15y + 23 = 0
7x – 2y – 20 = 0
find x and y
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Answer 1

Answer:

Step-by-step explanation:

In Elimination Method .

11x+15y+23=0

11x+15y= -23------------------------------------ (equ.1st)

7x-2y-20=0

7x-2y=20---------------------------------------- (equ.2nd)

11x+15y=-23

7x-2y = 20

multiply by (2) in equ. 1st &( 15) in equ. 2nd we get.

22x+30y= -46-------------- ------------------( equ. 3rd)

105x-30y= 300------------------------------- (equ. 4th)

127x=254

X=254/127

X = 2.

put the value of X in equ. 2nd

7x-2y=20

7(2)-2y =20. (X=2)

14-2y =20

-2y=20-14

-2y= 6

y= 6/-2

y=-3.

Your answer => X = 2 , Y= -3.