Please help me with these problems?

Question

1.Are the following lines parallel, perpendicular, or neither?
L1 through (–4, –7) and (1, 3)
L2 through (2, 6) and (4, 10)

2. Write the equation of the line passing through (–3, –5) and (3, 0).

3. Write the equation of the line which has y-intercept (0, 5) and is perpendicular to the line with equation y = –3x + 1.

4. Given f(x) = 5x2 – 3x + 1, find f(–2).

5. Rewrite the equation 2x – 3y = –6 as a function of x

6. One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. Find the larger number.

I have answered 10 of these but it that these I can't solve..........

Answer 1

1> 2
2> (5x/6)-(5/2)
3> y=3x+5
4> 27
5> 2+(2/3)x
6> 5+12= 17

may Allah save you if you donno how to solve these simple ones

Answer 2

See the following site for point slope formula:
http://www.freemathhelp.com/point-slope.html

1. Solve for slopes for each line (y2-y1)/(x2-x1) and then plug that in for m and use one of the sets of points for x and y in point-slope formula.

If lines are parallel, they have same slope; if perp, then slopes are negative inverses of each other.

2. Solve for slopes for each line (y2-y1)/(x2-x1) and then plug that in for m and use the set of points for x and y in point-slope formula.

3. take negative inverse of slope; use point-slope formula.

4. whereever you see x, put in the value (-2) and solve

5. Simply means to rearrange equation using sub/mult/add/subtraction to solve for x

6. Start with defining one of the variables: let x = first number, let x + 12 = second number

I hope this helps!

Answer 3

Have you given these a try, yet? What answers did you come up with? Please let us know the answers you have, and we'll help compare our answers :-)