Question

35.
If x² + y2=25, and y=2x, find x.
A. 5 B. 25 C.V125 D.V5​

Answer 1

Answer:-

Equation : x² + y² = 25

Given:-

y = 2x

x² + (2x)² = 25

=) x² + 4x² = 25

=) 5x² = 25

=) x = 5

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Answer 2

Step-by-step explanation:

Here ,

${x}^{2} + {y}^{2} = 25 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: (1) \\ and \: \: y = 2x \\ \\ then \: value \: of \: y \: is \: put \: in \: the \: equation \: (1) \: \: we \: get \\ \\ {x}^{2} + {(2x)}^{2} = 25 \\ \\ {x}^{2} + 4 {x}^{2} = 25 \\ \\ 5 {x}^{2} = 25 \\ \\ {x}^{2} = 5 \\ \\ x = + - \sqrt{5}$

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