Question

What is the equation of the following line written in general form? (The y-intercept is -1.).

Answer 1

Answer:

The answer is C.

Step-by-step explanation:

In the graph above, it is a positive gradient so option A and B cannot be applied.

Next you have to look at the y-intercept where the line touches the y-axis so -1 is the y-intercept.

The slope-form equation is y = mx + b where m represents gradient amd b is y-intercept :

Option A,

$- 2x - y - 1 = 0$

$y = - 2x - 1 \: (incorrect \: m)$

Option B,

$2x + y - 1 = 0$

$y = - 2x + 1 \: (incorrect \: m \: and \: b)$

Option C,

$2x - y - 1 = 0$

$y = 2x - 1 \: (correct \: m \: and \: b)$