algebra (check plz)
posted by <3 on .
write an equation in slopeintercept form of the line that passes through the given points.
a. (6,1), (3,7)
b. (2/3,4), (6, 1/3)
write an equation in pointslope form of the line that passes through the given poitns.
c. (2,5), (4,3)
d. (1/2,1), (2/3,6)
_______________________
this is what I got.. is it correct?
a. y = 8x/3 + 1
b. y = 13x/20 + 107/30
c. y + 3 = (4/3)(x + 2)
d. y + 1 = 6x + 3
and if not, can you please correct them? (: thanks

a) your first point does not satisfy your equation, so your equation is incorrect
slope = (71)/(3+6) = 8/9
so y = (8/9)x + b
sub in (6,1)
1 = (8/9)(6) + b
9 = 48 + 9b
b = 39/9 = 13/3
so y = (8/9)x  13/3
b) ok
c) you picked the ycoordinate from one point, and the xcoordinate of the other !!
Instead : y + 3 = (4/3)(x  4) 
thanks!! (((:
what about D.? ): 
d) is not wrong, but it's not in its final form; you have a constant on each side.
Subtract one from each side to get rid of the 1 on the LHS and you'll be finished. 
okay (:
thanks again for your help!