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noemimiki2002 noemimiki2002
  • 14-06-2015
  • Mathematics
Answered

A line passes through the points (4,-4) and (8,12). What is the y-intercept of the line ?

Verified Answer :

beedavid
beedavid beedavid
  • 14-06-2015

\(\frac{y2-y1}{x2-x1}= \frac{y-y1}{x-x1}
= \frac{12-(-4)}{8-4}= \frac{y-(-4)}{x-4}\)
\(\frac{16}{4}= \frac{y-(-4)}{x-4 } = 4(x-4)=(y+4)\)
\(4x-16=y+4\)
\(4x=y+4+16\)
\(4x=y+20\)
\(y=4x-20\)


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