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Further Equations Homework- Help?

Hello, i need help with my maths homework and i'm hoping that somebody would be of assistance to me.

Okay the 1st question is:

Calculate the coordinates of the points of intersection of the graphs which have equations
x+ 2y = 5 and xy = 3

I got (-1,-3) and (6,1/2) as my answers. Is this correct?


The 2nd question is:
Solve the simultaneous equations 3x + y =7, x(2x+ 3y) = 0.

For some reason i can't do that question, i need help :P
Thanks.
Original post by Cainyy
Hello, i need help with my maths homework and i'm hoping that somebody would be of assistance to me.

Okay the 1st question is:

Calculate the coordinates of the points of intersection of the graphs which have equations
x+ 2y = 5 and xy = 3

I got (-1,-3) and (6,1/2) as my answers. Is this correct?


The 2nd question is:
Solve the simultaneous equations 3x + y =7, x(2x+ 3y) = 0.

For some reason i can't do that question, i need help :P
Thanks.


You can check whether your answers for q1 are correct by putting them in back to the two equations - you'll notice that both sets of coordinates satisfy xy=3 but neither satisfy x+2y = 5.

For q2, make either x or y the subject of one equation and work from there. (3x + y = 7) sounds easier to work with.

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