Hey the first thing you do is reduce the numerator which is 648 to do that you have to mutiply the denominator by the factors 10,5,2,1. and then the partial quotient will add up as 50+20+10+1=81 :)
7. y=4/3x-2
8. y= -1/2x+5
9. x= -1 undefined
Triangle RTS is a right triangle and QTP is also a right triangle
look for the little square in the corners of a right triangle
(8*4)xy/ (8*3)yz= 4x/3z
Break apart the each expression to its simpler parts. The 8s cross each other out and you have 4xy/3yz left. Then you cancel the variables that match. The only ones are the ys. Hence the answer is what you have left over and cannot cancel out or reduce
Hopes this helps
Only GOD can help you god bless you AMEN