Posted by **Karen** on Sunday, October 17, 2010 at 3:02pm.

Can you check these for me.

Directions: Find the slope of the line that passes through each pair of points.

1. (3,-8) and (-5,2)

Answer: -10/8

2. (-10,-3) and (7,2)

Answer: -5,-17

3. (-7,-6) and (3,-6)

Answer: 9

4. (8,2) and (8,-1)

Answer: 0 undefined

Directions: State whether the graphs of the following equations are parallel, perpendicular, or neither.

5. 2x+3y=4

3x+2y=6

Answer: parallel

6. 1/2x+2y=1

4x-y=3

Answer: parallel

7. 6x-9y=4

2/3x-y=11

Answer: perpendicular

8. y-7=0

3x=5

Answer: neither

Math Problem: A pyramid of aluminum cans is built against a wall so that there are two cans in the top row, four cans in the second row, six cans in the third row , and so on. How many rows are there if the pyramid contains 1190 cans?

Answer: 595 rows

- Algebra/Math -
**Bosnian**, Sunday, October 17, 2010 at 8:05pm
Question 1-5:

slope is tangens of angle betwen x-axis and line.

Equation is:

tan(alpha)=(y2-y1)/(x2-x1)

Firs 5 question is O.K

- Algebra/Math -
**Bosnian**, Sunday, October 17, 2010 at 8:19pm
Sorry. Answer for question 5 is not correct.

2x+3y=4 , 3y=-2x+4 (Divided with 3)

y=(-2/3)x+4/3 Slope (-2/3)

3x+2y=6 , 2y=-3x+6 (Divided with 2)

y=(-3/2)x+3 Slope(-3/2)

- Algebra/Math -
**Bosnian**, Sunday, October 17, 2010 at 8:30pm
Question 6

(1/2)x+2y=1 , 2y=(-1/2)x+1

(Divided with 2) y=(-1/4)x+1/2

Slope(-1/4)

4x-y=3 , y=4x-3 (Slope 4)

Perpendicular

- Algebra/Math -
**Bosnian**, Sunday, October 17, 2010 at 8:35pm
Question 7

6x-9y=4 , -9y=-6x*4 (Divided with -9)

y=(-6/-9)x-4/9

y=(2/3)x-4/9 Slope (2/3)

(2/3)x-y=11 , y=(2/3)x-11 Slope (2/3)

Parallel

- Algebra/Math -
**Bosnian**, Sunday, October 17, 2010 at 8:44pm
Best way to check that is that you drive this lines in grid.Is enough 2 points for any lines.

For question 5 draw lines

(-2/3)x+4/3 and y=(-3/2)x+3

For question 6 draw lines

(-1/4)x+1/2 and y=4x-3

For question 7 draw lines

(2/3)x-4/9 and (2/3)x-11

- Algebra/Math -
**Bosnian**, Sunday, October 17, 2010 at 8:50pm
Question 8

y-7=0 y=7

For all values of x y=7

That is line parallel with x-axis

3x=5 (divided with 3)

x=5/3

For all values of y x=5/3

That is line p0arallel with y-axis

- Algebra/Math -
**De**, Monday, September 12, 2011 at 11:22pm
3x(5-(10-8)

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