Question 6121
Perhaps the appropriate question should be...what is the equation of the line that passes through these two points, (-3, -4) and (4, 10)?

You could start with the slope-intercept form of the equation of a line:
y = mx + b

Find the slope, m, using the given x and y coordinates of the given points.

m = (y2 - y1)/(x2 - x1)
m = (10 - (-4))/(4 - (-3))
m = 14/7
m = 2

Now you have:  y = 2x + b  You need to find the value of b, the y-intercept.
You do this by substituting the x, y values from either of the two given points and solve for b. Let's use the second point, (4, 10)

10 = 2(4) + b  Solve for b.
10 = 8 + b  Subtract 8 from both sides.
2 = b

Now you can write the equation of the line that passes through the two given points:

y = 2x + 2

The verification is left as an exercise for the student.