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# Help Simultaneous equation watch

1. x²+y²=17
3y+x=11

help solving this plsssssss
2. Assuming you want to find the points of intersection.

A standard technique is to eliminate one of the variables. In this case looking at your second expression, you can express y in terms of x, then substitute this into the first equation.

You now have a quadratic in y, which can be factorised, but it's not the easiest one in the world.

Then plug your y values back into the second equation to get the corresponding x values.
3. Don't forget those brackets when you sub the second equation into the first.
4. in first equation make either X or Y the subject then plug in to the second equation....

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Updated: March 22, 2009
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