Posted by Elisa on Saturday, September 26, 2009 at 6:35am.
Write the equation passing through the points (9, 6 ) and (1, 5). The worksheet has multiple choice, so I know y intercept is either 39/10 or 39/10.
I have 11/10x plus b
then 11 (1) is 11
10(1) is 10
Then 5 plus 11/10
I change 5 to 15/10 but I'm getting 26/10.
What am I doing wrong?

fraction help algebra  MathMate, Saturday, September 26, 2009 at 7:13pm
Given P1(9, 6) and P2(1, 5)
If the line is not vertical, the line through the two points has a slope of
m=(y2y1)/(x2x1)
=(56)/(1(9)
=11/10
This should eliminate some of the choices.
To find the intercept, you can use
(yy1)=m(xx1)
y=(11/10)(x(9)+6
=(11/10)x  39/10
confirming one of your two options.
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