Question

Se 2x−y=2 e x+3y=15 , dê o valor numérico de x2+y2.

Answer 1

2X-Y=2
2X=2+Y
X=(2+Y)/2

X+3Y=15

(2+Y)/2 + 3Y=15
(2+Y+6Y)/2=15
7Y=15.2-2
7Y=30-2
7Y=28
Y=28/7
Y=4

X=(2+Y)/2
X=(2+4)/2
X=6/2
X=3

X²+Y²=
3²+4²=
9+16=

25