Question

5)जर 12x+17y = 48,17x+12y = 68 तरxy ची किंमत खालीलपैकी कोणती आहे?
A)4
B)-4
C)6
60)-6​

Answer 1

Explanation:

12x+17y=48. (1)

17x+12y=68. (2)

add equation(1) and (2)

29x+29y=116

x+y=4. (3)

subtract equation (1) from equation (2),

5x-5y=20

x-y=4. (4)

add equation (3) and (4)

2x=8

x=4

put value of x in equation (3),

y=0

hence value of xy=(4*0)=0