Test Tommorow - Just can't seem to get the hang of it...

1)

2)

3)

Any help is greatly appreciated..thanks

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- Apr 20th 2008, 12:06 PMBallplaya4237Nonlinear Systems of Equations
Test Tommorow - Just can't seem to get the hang of it...

1)

2)

3)

Any help is greatly appreciated..thanks - Apr 20th 2008, 12:13 PMMoo
Hello,

For 1), isolate y in the second equation and plug it in the first equation.

For 2), isolate y in the first equation, then plug it in the second and solve for X=x² like any quadratic equation

For 3), isolate x in the first and plug in the second. - Apr 20th 2008, 12:13 PMtopsquark
For each of these, pick one of the equations and solve for one unknown. Then plug that into the other equation.

For example, the first one I would solve the bottom equation for y:

and put that into the top equation:

Solve this for x and use that to solve for y.

-Dan - Apr 20th 2008, 12:52 PMBallplaya4237
Okay, I managed to solve both numbers 1 and 3...

But, 2 still eludes me...

I messed up copying the first time - Here's the correct number 2 equation

2)

- Apr 20th 2008, 12:55 PMMoo
This is the same princip : isolate y in the first equation and plug it in the second :)

Multiply the final equation by x², then substitute u=t² and solve it as a quadratic equation ;)