Question

a) si b)





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Answer 1

a) x + y = 30 => y= 30 - x

2x + 3y = 70

2x + 3( 30 - x)=70

2x + 90 - 3x = 70

-x + 90 = 70

-x = 70- 90

-x = -20

x = 20

y = 30 - x = 30 - 20 = 10

y=10

b)

$\sqrt{ \frac{x {}^{2} + y {}^{2} }{3} } = \sqrt{ \frac{20 {}^{2} + 10 {}^{2} }{3} } = \sqrt{ \frac{400 + 100}{3} }$

$\sqrt{ \frac{500}{3} } = \sqrt{166.6} = 7 \sqrt{85}$