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Mathematics 19 Online
OpenStudy (zenmo):

Find the angle between the lines (in radians and degrees). @please check my answer, I got negative numbers, and it's suppose to be positive@

OpenStudy (zenmo):

x-2y=7 6x+2y=5

OpenStudy (zenmo):

The book solution is positive (1.428, 81.9 degrees), but my answers are negative. What is wrong?

OpenStudy (zenmo):

|dw:1431864467823:dw|

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