Aline passes through -1, 1 and 3, 9.

what is the equation of the line in slope-intercept form?

Choice B. y = 2x + 3

Step-by-step explanation:

The slope-intercept form of the equation of a line is

y = mx + b,

where m = slope, and b = y-intercept.

We can find the slope from the 2 given points.

The slope is 2.

We now have

y = 2x + b

To find b, plug in the x- and y-coordinates of one of the points for x and y and solve for b. Let's use point (-1, 1). x = -1; y = 1.

y = 2x + b

1 = 2(-1) + b

1 = -2 + b

3 = b

b = 3

Now that we know b, the y-intercept, we plug it into the equation.

y = 2x + b

y = 2x + 3

Choice B. y = 2x + 3

step-by-step explanation: