Question

please help! a equation of the line that contains the origin and the point (1,2) is

A. y=2x
B. 4
C. 5
D. 6
E.7

Answer 1

first, find the slope between (0,0) and (1,2)
use change in y divided by change in x

Answer 2

2/-1?

Answer 3

So its A?

Answer 4

(2-0)/(1-0) = 2/1 = 2
so the slope is 2

y = 2x + b
use one of the points (0,0) is the easiest
replace y with 0 and x with 0 we get
0= 2*0 + b
0= b
so b is zero, and
y =2x+ b becomes
y=2x

Answer 5

ok thanks @phi :)