Give a geometric description of the following systems of equations -3 x 9 у 25 z = 3 + 1. -3 x 8 y 22 z Select Answer %3D 3 x + 9y + 24 z = 6 3 x + 15 y 15 z = 15 Select Answer 2. -4 x 20 y + 20 z -20 -6 x 30 y + 30z <-30 %3D 5x + 5 у + z -5 + 3. -4 x 3у + 3 z -4 Select Answer %3D -21 x 17 y + 11 z -14 %3D 5x + 5 y 3 y у + -5 Select Answer 4. -4 x -4 %3D -21 x 17 y + 11 z -11 %3D N N

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A: I am attaching image so that you understand each and every step.

Q: 7+7

A: Addition of 7 with 7,  that is 7+7= 14 

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A: If lower and upper integral are equal then we say that function is Riemann integrable. 

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