Robert C.

asked • 12/25/14

x-y=5 After doing the re-arrange thing, I get slope =1 or 1/1 and y intercept =5 the book says -5 Which is correct?

Express x-y=5 in slope and y-intercept form then identify slope and y-intercept.

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Michael F. answered • 12/25/14

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x-y=5 is the same as y=x-5, which for x=0 gives y=-5
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Robert C.

x-y=5 =  x-x-y=5-x  =  -y=-x+5 = y=x+5  Slope=1 Y-intercept=5 Is how I worked it.  Book says slope= 1 and y-intercept =-5
 
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12/25/14

Philip P.

-y = -x + 5 is correct, but when you multiply both sides by -1, you have to multiply both the x and the 5 by -1.  So -y = -x + 5 becomes y = x - 5 as Michael showed you.  Slope is 1, y-intercept is -5.
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12/25/14

Robert C.

Oops! Thanks Philip!!!! A mistake I make frequently.  Happy holidays and thanks again.
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12/25/14

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