I suck so bad at maths...
14.13 Are dots X, Y and Z located on the same straight? Explain the answer!
A)XY = a XZ = 3a, YZ=4a
B) XY = a, YZ =2a +1, YZ = 3a
C)XY = a +2, YZ = 3a +2, YZ = 2a
D)XY = 5, YZ = a +2, YZ =2a +7
Thats my Geometry homework, can anyone explain what is what, i dont understand a thing ^_^