Question

What is the equation of the line that passes through the points (-1, 3) and (1, 11)?

A. 4x - y = 1

B. 4x + y = 1

C. x - 4y = -13

D. 4x - y = -7

Answer 1

Did you do the math?

Answer 2

You could simply substitute the two points and see if they work.

A. 4x - y = 1

(-1, 3) ==> 4(-1) - (3) = -4 - 3 = -7 and that is NOT 1 -- Forget about A

B. 4x + y = 1

Demonstrate!

Answer 3

http://www.hackmath.net/en/calculator/line-slope?x0=-1&y0=3&x1=1&y1=11&submit=Solve

thus D is good answer: y = 4x+7

Answer 4

Thank you :)