Question

13. If x + y = 8 and x - y = 4, then the value of xy is:
A
24
B 4
C 6
D 12​

Answer 1

Answer:

12

Step-by-step explanation:

x + y = 8

x - y = 4

on adding

2x = 12

x = 6

6 + y = 8

y = 2

xy = 12

Answer 2

Answer:

x+y=8

x-y=4

2x=12

x=6

y=8-x

=8-6=2

xy=2×6=12

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