Linear and quadratic systems — Basic example | Math | SAT | Khan Academy

Watch Sal work through a basic Linear and quadratic systems problem.

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[mocha]

How do you determine which side to move all the numbers to in order to form your quadratic equation? That is what I am really struggling with in these Khan Academy practices. I understand the steps, but when I get a question wrong it is always because instead of moving the numbers to one side, I moved them to other side.

[truckbull]

Linear and quadratic systems formula is not working should I really learn this ?
every time I try to use the linear and quadratics system formula it never works I tried many videos websites they never give any real solid solution
the only real formula for those types of equation is to graph it in desmos graphing website but how do they calculate it? any solution

[alininjaixine]

Using this only for school nothing more