Question:
Find the equation of the line through the point ( - 1, 5) and making an intercept of - 2 on the y - axis.
Solution:
Given: The $y$ - intercept $=-2$.
The line passes through $(-1,5)$.
Formula to be used: y = mx + c where m is the slope of the line and c is the y - intercept.
The equation of the line is $y=m x+(-2)=m x-2$.
Now, this line passes through $(-1,5)$.
$\therefore 5=m(-1)-2=-m-2$ i.e. $m=-(5+2)=-7$
$\therefore y=(-7) x+(-2)=-7 x-2$ i.e. $7 x+y+2=0$
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