Question

7. If x + y =7 and x - y = 3, evaluate
(b) x2 + y?
(a) xy​

Answer 1

Answer:

Please mark me as BRAIN-LIST

Step-by-step explanation:

x+y=7 (1)

x-y=3 (2)

using(1),

x=7-y (3)

substituting the value of x in (2),

7-y-y=3

7-2y=3

-2y=3-7

-2y=-4

y=2 (4)

putting the value of y in (3),

x=7-2

x=5

(a) x2+y2

=(5) ^2 + (2) ^2

=25+4

=29

(b) xy

=5×2

=10

Hope it helps!