Question

If x + y = 1 and x - y = 7, find the value of xy
O 12
O-12
O 14
O-14​

Answer 1

Answer:

-12

Step-by-step explanation:

x+y = 1 ---(1)

x-y = 7 ---(2)

Adding (1) and (2)

2x = 8

x = 4 Substituting in (1)

y = -3

So xy = 4* [-3]

xy = -12