Question

write the equation of the line that passes through (2,1) and (5,-5)

Answer 1

first find the slope : -5-1/ 5-2 = -6/3 = -2
y=mx+b , m=-2 , (2,1)
1=-2(2)+b
1=-4+b
4+1=b
5=b
so the equation is y=-2x+5