Terminology used for Transformations

[kamie22]

Hi guys,

I was just wondering if it is ok to use the following terminology in the methods exam is ok, will I get marked down for writing the first part instead of the second?

Dilated by factor 1/2 from x-axis instead of dilated by factor 1/2 parallel to the y-axis
Dilated by factor 1/2 from y-axis instead of dilated by factor 1/2 parallel to the x-axis
Translated 3/2 units to the left instead of translated 3/2 units in the negative x direction
Translated 4 units down instead of translated 4 units in the negative y direction

Thanks heaps!

[Lear]

I believe your dilation is fine however your translations do indeed need to be done in the way you have written in bold.

[Sine]

Dilated by factor 1/2 from x-axis instead of dilated by factor 1/2 parallel to the y-axis
Dilated by factor 1/2 from y-axis instead of dilated by factor 1/2 parallel to the x-axis
Translated 3/2 units to the left instead of translated 3/2 units in the negative x direction
Translated 4 units down instead of translated 4 units in the negative y direction

imo this is the safest way to go, but if you want you could go with "parallel" to x-axis but VCAA tend to prefer "from the" x-axis

Dilation of scalar factor k from the x-axis
Dilation of scalar factor k from the y-axis
Reflection in the x-axis
Reflection in the y-axis
Translation h units in the positive (negative) direction of the x-axis
Translation k units in the positive (negative) direction of the y-axis