System A System B
x-4y=1
5x+6y=-5 5x+6y=-5. x=1+4
1) How can we get System B from System d?

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?