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3. x+y=9
(x+y)²=9²
x²+y²+2xy=81
x²+y²+2(20)=81
x²+y²+40=81
x²+y²=41
4.50,000
5. I and IV quadrants
6. infinite solutions
FOLLOW AND MARK AS BRAINLIEST
Answer
41
Step-by-step explanation:
(x+y)^2 = (9)^2
= x^2 + y^2 + 2×x×y =81
= x^2 + y^2 + 2 × 20 = 81 (xy =20 given)
= x^2 + y^2 + 40 = 81
= x^2 + y^2 = 81 - 40
= x^2 + y^2 = 41 Ans