Question

If 2x + y = 5 and 3x - 4y = 2, then the value of 2xy is:​

Answer 1

Answer:

4

Step-by-step explanation:

2x + y = 5 ...(i)

and

3x - 4y = 2 ...(ii)

Multiplying (i) by 4 and adding (ii) to it, we get : 11x = 22 or x = 2.

Putting x = 2 in (i), we get : y = 1. So, 2xy = 2 * 2 * 1 = 4.

Answer 2

Answer:

Step-by-step explanation:

You can do like this

Make constant of y same i.e, ‘4’

Now multiply who with four

Means

4(2x+y) = 4*5

8x + 4y = 20

Now subtract eq 1 to eq 2

So it is

8x + 4y - 3x - 4y = 20-2 = 18

5x =18

X = 18/5=3.6

Y = -7.2

2xy = 2 × 3.6 × -7.2 = -51.84

Hope this help