Science

Math

Humanities

... and beyond

Socratic Meta
Featured Answers

Topics

Question #6f64b

1 Answer

Mar 27, 2017

See below

Explanation:

$2 x + y = 0 \Rightarrow y = - 2 x$ $2x + y = 0 implies y = - 2x$

And next:

$5 x^{2} + y^{2} = 9 \Rightarrow 5 x^{2} + {(- 2 x)}^{2} = 9$ $5x^2 + y^2 = 9 implies 5x^2 + (-2x)^2 = 9$

$\Rightarrow 9 x^{2} = 9 \Rightarrow x = \pm 1$ $implies 9x^2 = 9 implies x = pm 1$

$\Rightarrow y = \pm 2$ $implies y = pm 2$

Related questions

See all questions in Comparing Methods for Solving Quadratics

Impact of this question

1070 views around the world

You can reuse this answer
Creative Commons License