To use the elimination method, you have to create variables that have the same coefficient, then you can eliminate them.
Answer:
105
Step-by-step explanation:
35 quarters ($8.75)
21 dimes ($2.10)
49 nickels ($2.45)
Answer:
it either can be 3:6 or 6:3 but I think its 3:6
Answer:
see below
Step-by-step explanation:
In the attachment, the points are listed in the order given in the problem statement. (They are listed to the right of the "rotation matrix", with x-coordinates above y-coordinates.)
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I really don't like to do repetitive calculations, so I try to use a graphing calculator or spreadsheet whenever possible. Angles are measured CCW.
As always, the rotation transformations are ...
180° — (x, y) ⇒ (-x, -y)
270° — (x, y) ⇒ (y, -x)