I want to make sure these are correct!?

Question

1. Find the slope of any line perpendicular to the line through points (2, 6) and (1, 3).

I got -3

2. Write the equation of the line with x-intercept (-3, 0) and undefind slope.

I got y = -3

3. A line passing through (0, 2) and (5, y) is perpendicular to a line with slope -5/8. Find the value of y.

I got 9

Please tell me if these are correct or not. If they are wrong I will try to figure them out again. Thanks.

Answer 1

one and two are correct but three isn't. you're close though! good luck!

oh put it this way, perpendicular slope is gonna be like its exact opposite.....that's your hint!

Answer 2

for #1, remember that the slope a line perpendicular is the negative inverse. Since the slope of the line through your two points is 3, the perpendicular slope is -1/3

#2 is correct

for #3, the slope of the line is (y-2) / 5 , so the perpendicular slope is -5 / (y-2)
since -5 / (y-2) = -5/8
y-2 = 8

so y = 10

Answer 3

slope= y1-y2
x1-x2 (2,6) (1,3) 6-3
x1 y1 x2 y2 2-1
3/1 = 3 the first one is 3.. since this is a positive slope answer is positive.
I think number 2 is right , but i think they want you to write an equation something like,example, y= 0 + -3 ,and for number 3 i don't understand the questioning i think your suppose to look at the graph to answer. since , number 1 was wrong it might affect your answer.

Answer 4

*sigh* So many answers.

On #2 - slope is undefined for vertical lines. y = -3 is a horizontal line, so it would have slope 0. You want an equation like x = -3.

Answer 5

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Answer 6

3 is wrong.. I can't help you any further.