Question

helppppppppppppp someone I'll mark brainliest​

Answer 1

Answer:

Step-by-step explanation:

Don't have to mark it as brainliest

Answer 2

Answer:

$\frac{6}{ \sqrt{x} } + \frac{15}{ \sqrt{y} } = 5 \\ \frac{21}{ \sqrt{x} } - \frac{10}{ \sqrt{y} } = 5 \\ \\ let \: \frac{1}{ \sqrt{x} } = a \: and \: \frac{1}{ \sqrt{y} } = b \\ \\ now \\ 6a + 15b = 5 - - - - (i)\: \: \: \: \\ 21a - 10b = 5 \: - - - - (ii) \\ \\ multiply \: eq.(i) \: by \: 21 \: and \: eq.(ii) \: by \: 6 \: \: we \: get \\ \\ 126a + 315b = 105 \\ 126a - 60b = 30 \\ \\ now \: by \: elimination \: we \: have \\ \\ 126a + 315b = 105 \\ 126a - 60b = 30 \: \: \: \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: ( \: subtract \: ) \\ - - - - - - - - \\ 375b = 75 \\ - - - - - - - - \\ b = \frac{75}{375} = \frac{1}{5} \\ putting \: b = \frac{1}{5} in \: eq.(i) \: we \: get \\ 126a + 315 \times \frac{1}{5} = 105 \\ 126a = 42 \\ a = \frac{42}{126} = \frac{1}{3} \\ \\ \frac{1}{ \sqrt{x} } = a \\ \frac{1}{ \sqrt{x} } = \frac{1}{3} \\ \sqrt{x} = 3 \\ (x = 9) \\ \\ \frac{1}{ \sqrt{y} } = b \\ \frac{1}{ \sqrt{y} } = \frac{1}{5} \\ \sqrt{y} = 5 \\ (y = 25)$