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# simultaneous equation

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Why bother with a post grad course - waste of time? 17-10-2016
1. y=10-x
y=2xpower2+4
2. (Original post by ariel rai khadka)
y=10-x
y=2xpower2+4
y= 10 - x
y=2x^2 + 4
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10-x=2x^2 +4
-x=2x^2-6
2x^2 + x - 6 = 0
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factorise:

2x(x+2)-3(x+2) = 0
(2x-3)(x+2)=0
x = -2 and 3/2
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substitute in the value of x
y = 12
y= 8.5
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x= -2, y =12
x= 3/2, y = 8.5

3. (Original post by Jassy16)
^
You shouldn't give the answers, but well done, very clear working, A+

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