Question

What is the equation of this graph? coordinates: (1,7), (0,0),(-1,-7)

Answer 1

y=7x

Explanation:

y=ax+b

put (x,y)=(1,7), (0,0),(-1,-7)

when (0,0)

0=b

y=ax, put (1,7)

a=7

*If you want to check again, also put (-1,-7)

So, y=ax+b equal y= 7x

Answer 2

y = 7x

Explanation:

Slope: (7-0)/(1-0) = 7

y-intercept is obviously 0

y = 7x + 0

y = 7x