Translation matrix

I have to find a matrix equation in the form of the one below  Matrix

for this translation

20 pixels to the left and 50 pixels up

how do I go about doing this.
tango2009Asked:
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TommySzalapskiConnect With a Mentor Commented:
Circle the correct answers
20 pixels to the left means x is (increasing / decreasing) by 20
50 pixels up means y is (increasing / decreasing) by 50
dx = (change in x / change in y)
dy = (change in y / change in cow)

Since this zone is usually used for homework, I'll let you figure it out from here.
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Muhammad Ahmad ImranDatabase DeveloperCommented:
can you explain your question a little more
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phoffricConnect With a Mentor Commented:
Here is a video to help you:
    http://www.youtube.com/watch?v=8HWvyahgesY&feature=channel
17:30 begins homogenous matrix, but starting at 04:08 may be useful for background.
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KendorCommented:
it is actually all written on your image...
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