Book Maths Puzzle Algebra

CAN YOU HELP WITH A PROB I AM NOT ABLE TO SOLVE
9X-7Y+3Z=-48
2X+3Y+4Z=-4
-3X+2Y-5Z=8

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Book Other Question

1. Let x represent the number and translate the given phrase into an algebraic equation.
a. the difference between 2 and 3 times a number.
b. the sum of 5 and twice a number is this is an Ellipses problem but I can't figure it out. Could you please help me.

x^2+4y^2-10x-40y+121=0