Which numbers are missing? – Math puzzle

From Math Queen.

In this math video I (Susanne) explain how to solve this math puzzle. We solve the system of equations by eliminating variables. Mathematics explained.

00:00 Intro – Math puzzle
0:15 Find the equations
1:07 System of equations
8:31 Quadratic Equation
12:26 Solutions
15:30 See you later!

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