Posted by anonymous on Friday, April 2, 2010 at 11:12am.
A triangle has 180º.
B = 5A
C = 4A - 18º
A + B + C = 180º
Substitute values of B and C in terms of A in the last equation to solve for A. Use that value to get B and C in the other two equations. Check by inserting the three values found into the last equation.
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