3 oranges= $1.35, so one orange cost $0.45 4 oranges= $1.80, one orange cost $0.45 5 oranges= $2.25, one orange cost $0.45 If one orange cost $0.45, then ten cost $4.50 ($0.45*10)
If you were to buy ten oranges are $4.25, this would make each orange $0.425 ($0.43 rounded).
This means that if you were to buy ten oranges, it would be cheaper to buy ten for $4.25, instead of buying two lots of 5 for $2.25 each.
In a coordinate plane (2 dimensions), two lines are parallel or perpendicular or the same line. In three dimensions, the lines are parallel or perpendicular or skew. Two straight lines never intersect at more than one point.
