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OpenStudy (anonymous):
Find the measure of the acute angle formed by 4x-5y=12 and 6x+11y=20.
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OpenStudy (anonymous):
slope of first line= 4/5 second line= -6/11
OpenStudy (anonymous):
\[\tan \theta ={ {m _{1}-m _{2}} \over{1+m _{1}m _{2}}}\]
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