Help with Homework! SERIOUS HELP ONLY!?

Question

I am struggling with a few algebra problems here. I would appreciate it if someone could help. These are multiple choice:

1. A line passing through (5, –6) and (–9, y) is perpendicular to a line with slope . Find the value of y.

A) 1 B) –4 C) –2 D) –1


2. Given f(x) = –x – 4, find f(a – 3).

A) a – 8 B) –a – 1 C) a – 1 D) –a – 7

3. Determine which two equations represent parallel lines.

(a) y = –9x + 4(b) y = 9x + 4(c) y = x + 4
(d) y = –9x + 5

Answer 1

3-- a and D--if the # before x is the same, they are parallel

2. I won't do it, but you just plug a-3 in where x is
-(a-3) -4
Don't forget to distribute the negative!

Answer 2

Question 1) is incomplete. What slope is it perpendicular to?

2) f(x) = -x - 4. Therefore

f(a - 3) = -(a - 3) - 4 = -a + 3 - 4 = -a - 1

3) Parallel lines have the same slope. For a line in the form
y = mx + b, m is the slope.

All we have to do is look at the equations which have the same coefficient of x.

Answer 3

On the first question, you need to write the slope.

2. f(a-3)= -(a-3)-4
f(a-3)= -a+3-4
f(a-3)= -a-1

The answer is B.

3. Parallel lines are defined by having the same slope. We are trying to find 2 answers with the same slope. Since these lines are in y-intercept form, we can easily tell the slope. y=mx+b

m will give us the slope.

Since both (a) and (d) have the same m value (-9), they are parallel.

I hope that this helps.

Answer 4

1) You need to make the first question more clearer.

2)f(a-3)=-(a-3)-4
-a+3-4
-a-1

The answer is B

3)a and d are the parallel