Question

find an equation of the line having the given slope and containing the given point
m=-2, (1,8)

Answer 1

y=mx+c
y2-8=-2*(x2-1)
y2=-2x2+10

Answer 2

the equation of a line is y=mx+c.
since m=-2,y=-2x+c
then substitute x=1,y=8(since the point (x,y)=(1,8)in y=-2x+c
8=-2(1)+c
8=-2+c
10=c
therefore the equation is
y=-2x+10