Question

Find the value of 9x + 7y -2xy, when x= 2 and y= 1​

Answer 1

Answer:

7x+9y=42 ...........(1)

9x+7y=22 ...........(2)

Add equations (1) and (2),

7x+9y+9x+7y=42+22

16x+16y=64

16(x+y)=64

x+y=4

I HOPE IT'S HELPFULL

Answer 2

Answer:

18

Step-by-step explanation:

9

$9 \times 2 + 7 \times 1 - ( - 2 \times 2 \times 1)$

$18 + 7 - 4$

$25 - 4$

$= 21$