- #1

D.K

- 2

- 0

Say:

3x^2 - 2y = i

x + y = j

Solving for x and y in terms of i and j?

Note: This is not a homework problem, just a general question.

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- Thread starter D.K
- Start date

- #1

D.K

- 2

- 0

Say:

3x^2 - 2y = i

x + y = j

Solving for x and y in terms of i and j?

Note: This is not a homework problem, just a general question.

- #2

Char. Limit

Gold Member

- 1,216

- 22

Say:

3x^2 - 2y = i

x + y = j

Solving for x and y in terms of i and j?

Note: This is not a homework problem, just a general question.

Here, I would say y=j-x then substitute that in for y.

3x^2 - 2(j-x) = i

Solve for x...

[tex]x = \pm \frac{1}{3} \left(\sqrt{6 j+3 i+1}-1\right)[/tex]

Then, knowing what x is, substitute x in the second equation to express y in terms of i and j.

- #3

D.K

- 2

- 0

Here, I would say y=j-x then substitute that in for y.

3x^2 - 2(j-x) = i

Solve for x...

[tex]x = \pm \frac{1}{3} \left(\sqrt{6 j+3 i+1}-1\right)[/tex]

Then, knowing what x is, substitute x in the second equation to express y in terms of i and j.

Thanks a lot. For some reason, I have always had difficulty with simple things like these!

- #4

michaelc187

- 30

- 0

There are no workable non lin equations that aren't reduced to a sum lin eqautions

blah blah blah

blah blah blah

- #5

michaelc187

- 30

- 0

The real sht is identifying lin equations to reality

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