Question

2. If 2x+3y = 17 and 4x-y = 13, then xy= ... (a) 10 (b) 12 (c) 15 (d) 9​

Answer 1

Answer:

option (b) is correct.

Step-by-step explanation:

from equation (2) we see

4x - y = 13

but y = 3

hence,

=> 4x - 3 = 13

=> 4x = 13 + 3

=> 4x = 16

=> x = 16/4

= > x = 4

Answer 2

Answer:

b)12

Step-by-step explanation:

2x+3y=17. equ1

4x-y=13. equ2

equ 1 multiple by 2

4x+6y=34. equ3

equ3 - equ2

4x+6y=34

4x- y=13

-------------_--

7y= 21

y=21/7

y= 3

y=3 done

y=3 put in equation 2

4x-y=13

4x-3=13

4x=13+3

4x=16

x=16/4

x= 4

x=4

xy

3x4=12

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