Question

(v) 15(x + 2y)" + 3(x + 2y)​

Answer 1

multiply eq 1 by 1 and 2 by 7

7x-15y=2

7x+14y=21

subtract eq. 1st from 2nd

7x+14y=21

7x-15y=2

=>29y=19

y=19/29

put the value of y in eq1st

x+2x19/29=3

29x+38=87

29x=87-38

29x=49

x=49/29

Answer 2

Answer:

Disclaimer: There is error in the Q. In (II) there should have been 2x - 3y = 12

5x + 3y = 9 -----(I)

2x - 3y = 12 ----- (II)

Add (I) and (II)

7x = 21

x = 3

Putting the value of x = 3 in (I) we get

5(3)+3y=9⇒15+3y=9⇒3y=9-15=-6⇒y=-2

Thus, (x, y) = (3, -6).