- How to solve the linear system using substitution 4x-y=5 4x+4y=-4?

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Convert 19/3 into a mixed number (Please show work)? If the Earth is flat then does that mean there was no Moon Landing? (a/1) + b - 1.5=0
(a/2) +b - 9 = 0
how would you solve these equations simultaneously? A 300mg apple 5m above the ground falls. how fast was it travelling when it hit the ground? How can a star collapse into a black hole without a supernova? What changes it?