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# What is the Answer to this Simultaneous Equation ? watch

1. x+y=2
4y^2-x^2=11

I got x= -1/2 , x=7/2
y= 5/2 , y= -3/2

is that correct ? if not , what did you get and how ?
Thanks.
2. (Original post by money-for-all)
x+y=2
4y^2-x^2=11

I got x= -1/2 , x=7/2
y= 5/2 , y= -3/2

is that correct ? if not , what did you get and how ?
Thanks.
Tip: If you want to check your answers to an equation, plug the solutions back into the equation to see if it holds.
3. (Original post by money-for-all)
x+y=2
4y^2-x^2=11

I got x= -1/2 , x=7/2
y= 5/2 , y= -3/2

is that correct ? if not , what did you get and how ?
Thanks.
Sub 2-x as y into 4y^2-x^2 =11, then solve the quadratic to find the two values of x. Then find the two corresponding values of y by subbing the x values back into one of the two original equations. Good thing is you can always check your answers with sim equations

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