Question

If x+y=7 and x - y = 3, evaluate (a) xy (b) x² + y²​

Answer 1

The Ans. is pasted in pic see..

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Answer 2

Answer:

(a) 10

(b) 29

Step-by-step explanation:

Adding the given two equations, we get

$2x = 10 \\ x= 5$

Substituting x= 5, in the first equation, we get

$5 + y = 7 \\ y = 2$

So, x = 5, and y = 2.

(a) xy = 5×2 = 10

(b) x² + y² = 5² + 2² = 25 + 4 = 29