Find equation in slope-intercept form

  • Thread starter gillgill
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  • #1
gillgill
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find equation in slope-intercept form for line through (-2, 3/4) and (2/3, 5/2)
does y=21/32x+33/16 seem right?

find equation in slope-intercept form for line through
Horizontal, through (8,7)
is it y=7??

find equation in slope-intercept form for line with x-intercept -2/3 and perpendicular to 2x-y=4
does y=-1/2x+1/3 right?
 
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Answers and Replies

  • #2
andrevdh
Homework Helper
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You can test your first equation by substituting the points back into your equation.

The second equation y = 7 implies that for all x values the y value are 7. Does this seem right to you?

Your last equation cannot be right since the y-intercept is not the given one!
 
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  • #3
moose
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gillgill said:
find equation in slope-intercept form for line with x-intercept -2/3 and perpendicular to 2x-y=4
does y=-1/2x+1/3 right?

On this one, I got what you did, except the y-intercept of mine was negative. When I substituted -2/3 for x in y=-1/2x, i got 0=1/3 + b, therefore moving it to the other side would yield a negative...
 
  • #4
gillgill
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ic...thanks...
 

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