Write an equation in slope-intercept form (y=mx+b) for the line that passes through the given points.
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Let 
be the amount of time it takes to perform an arm routine and 
be the amount of time it takes to perform an abdominal routine. We see:
Subtracting the second equation from the first gives
. Substituting gives 
, so 
and 
.
Thus, an arm routine takes ten minutes and an abdominal routine takes thirty minutes.
Subtracting the second equation from the first gives
Thus, an arm routine takes ten minutes and an abdominal routine takes thirty minutes.
The answer is A because when you add the angles to get they equal 180. Then just solve for x.
The drawing isn't to scale
The drawing isn't to scale