Question

11. How many pairs of x and y satisfy 3x + 6y = 18 and
9x + 18y = 57?
(A) 2
(B) 1
(C) O
(D) None of these​

Answer 1

Step-by-step explanation:

comparing this equation with a1x+b1y+c1=0 and a2x+b2y+c2=0

3x+6y-18=0 and 9x+18y-57=0

a1=3/a2=9  ,b1=6/b2=18  ,c1=-18/c2=-57

we simplify them and get 1/3=1/3=1/3     in this case the lines are parallel and have many solutions

hope it helps u

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Answer 2

Answer:

(a)2 because 9 and 3 have same variable x

and 6 and 18 have same variable y ...