Question

Que.1 choose the correct alternative answers for the following questions. 1) If 3x+5y=9 and 4x+2y=12 then What is the value of x+y ?
options:-
A.3
B.16
C.9
D.7

Choose the correct option​

Answer 1

Answer:

(A) 3

3x+5y=9

can also be written as: 12x + 20y = 36

4x + 2y =12

can also be written as: 12x + 6y = 36

subtracting both equations,

14y = 0

hence y = 0.

putting value of y in, 3x + 5y = 9

3x +5(0) = 9

3x=9

x=3

hence x = 3 and y = 0

x + y = 3 + 0 = 3

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