Question

What is the equation of the line that passes through the points (-2, 1) and (1, 10)?

3x - y = -7

3x - y = -5

3x - y = 5

x + 3y = -5

Answer 1

calculate slope which is:\[\Delta y \over \Delta x\]

Answer 2

\[\Delta y=1-10=-9\]\[\Delta x= -2 -1=-3 \]

Answer 3

slope m= -9/-3= 3

Answer 4

Now develop the equation:
3 = (y-1)/x-(-2)
3x+6=y-1
3x-y=-7

Answer 5

That looks like the first one.