Question

Line QR goes through points Q(0, 1) and R(2, 7). Which equation represents line QR?

Answer 1

For this we will use equation that gives us equation of line that goes through 2 given points.

that equation is:
 $y - y1= \frac{y2 - y1}{x2 - x1} (x - x1)$

now we implement our given coordinates.
let Q be point 1 and R be point 2
y - 1 = 6/2(x - 0)
y - 1 = 3x

Answer is b.