Question

A line goes through the point (-6,-2) and has a slope of -3. what is the value of a if the point (a,7) lies on the line>

Answer 1

Answer:

a=-9

Step-by-step explanation:

if (a,7) lies on this line then the slope should be -3

$slope \: of \: a \: line \: passing \: through \: the \: points \: (x1 \: y1) \: and \: \: (x2 \: \: \: y2) \: \\ = \frac{y2 - y1}{x2 - x1}$

—-—>

$\frac{7 - ( - 2)}{ a - ( - 6)} = - 3$

$\frac{9}{a + 6} = - 3$

$- 3a - 18 = 9$

a=-9

Answer 2

Answer:

The answer is 3.

Step-by-step explanation:

What your going to want to do is set up the problem as

$\frac{7-(-2)}{a-6}$ . Then, your going to cross out both of the negatives which make a positive. That gives you $\frac{9}{6}$. Now,  you going to simplify and that gives you positive 3 not negative.