What is the Y intercept of the points (5,9) (6,7)?

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Answer 1 · 2016-07-21T03:19:03

19

I assume that you mean "What is the $Y$ intercept of the line joining (5,9) and (6,7)?"

We start by writing down the equation of a straight line
$y= m x+c$
here $m$ is the slope and $c$ is the $Y$ intercept.

Since (5,9) and (6,7) are on this line, we have

$9 = 5m+c$
$7 = 6m+c$

Subtracting,

$2 = -m$

Putting this back in any one of the equations, we get

$9 = 5 xx (-2) +c$

so that $c=19$ .