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VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Mathematical Methods CAS => Topic started by: kamie22 on May 12, 2018, 11:20:46 am

Title: Terminology used for Transformations
Post by: kamie22 on May 12, 2018, 11:20:46 am

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!

Title: Re: Terminology used for Transformations
Post by: Lear on May 12, 2018, 12:50:47 pm

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

Title: Re: Terminology used for Transformations
Post by: Sine on May 12, 2018, 12:57:12 pm

Quote from: kamie22 on May 12, 2018, 11:20:46 am

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