3.18.3 Intersection Between Three Planes | IB Math AA | Mr. Flynn IB

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In this lesson you will learn how to find the point and line between three planes. This topic can be found in the IB Math course Analysis and Approaches (AA) HL.
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Could you explain why the bottom equation is going to have infinite solutions? and how you just cancelled the third equation using the galgien elimination and make z=t? I don't really get that part

SaiKrishna-ysrs
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Is there any way to get the same solutions as your calculator for the Casio fx-9750GII calculator? The simultaneous equations function in my calculator can't handle the heat of infinite solutions :(

MayDay-zbky
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What if these types of questions are on Paper 1?

HSkk-yium
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Is the calculator in exam mode? Is this feature allowed in the exam?

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