Question

1. What is an equation for the line with slope 2/3 and y-intercept 9?
2. What is an equation in slope-intercept form for the line that passes through the points (1,-3) and (3,1).
3. For the equation -4y = 8x, what is the constant of variation?
4. Suppose y varies directly with x, and y = 24 when x=8. What is the value of y when x = 10?

Answer 1

Do you know what slope intercept form is?

Answer 2

No, all of this is so confusing.

Answer 3

This is slope intercept form

y=mx+b

m stands for the slope and b stands for the y intercept, so for your first question you were given those values. Just plug them in

Answer 4

This is probably wrong but would be y=2/3x+9

Answer 5

Thats right:)

Answer 6

Thank you.I must be making it harder than it need be,lol.

Answer 7

Maybeee.

For the second one, do you know how to find the slope given two points?

Answer 8

Not really, I can see the graph but for some reason just can't seem to get it.

Answer 9

Your points are (x1,y1) and (x2,y2)

plugging those into the formula you have

(1+3)/(3-1)

what is that simplified?

Answer 10

c'mon, you can do it..

Answer 11

xD

Answer 12

is it always y over x

Answer 13

Yes, its a formula

Answer 14

would it be y=3x+1

Answer 15

what?

Answer 16

Not quite...find the slope first

(1+3)/(3-1) simplifies to 4/2 or 2

so 2 is your slope.

now you need to use point slope form to get your equation

Answer 17

do you understand why he got 2 out of that?

Answer 18

no

Answer 19

the formula for the slope is: y2-y1/x2-x1

Answer 20

get it?