Hey just need my answer to be checked on this problem(adsbygoogle = window.adsbygoogle || []).push({});

just to clarify x2 means x squared!

Solve the following

y = 2 - x

x2 + 2xy = 3

Substitute equations

x2 + 2x(2 - x) = 3

x2 + 4x - 2 x2 = 3

-x2 + 4x - 3 = 0

Factorising

(-x + 1) (x - 3) = 0

so x = -1 and 3

_____________________________________________

as y = 2 - x

y = 2 - 3

= -1

y = 2 + 1

= 3

so the co ordinates for the two roots of this curve will be

(-1, 3) and (3, -1)

is this the right answer? i believe it to be, but my answer books says differently!

Please check my answer.

Thanx in advance!

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# Simultaneous equation question

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