Question

me ajudem por favor ✨❤️​

Answer 1

$\left\{ \begin{array}{l} x + y = 40 \\ x - y = 20 \end{array}\right.\\\\x+x+y-y=40+202x=60\\x=30\\\\x+y = 40\\30+y=40\\y=10$

A) $x^2 + y = 30^2 + 10 = 900 + 10 = 910$

B) $x^2-y^2=30^2-10^2=900-100=800$

C) $\frac{x}{y}=\frac{30}{10}=3$

D) $x^2+y^2=30^2+10^2=900+100=1000$