Please answer quickly.
1. For the equation -4y=8x, what is the constant variation?
A -4
B -2
C 1
D 2
2. Suppose y varies with x, and y = 24 when x = 8. What is th e value of y when x = 10?
A 10
B 30
C 80
D 240
3. What is an equation for the line with slope 2/3 y-intercept 9?
A y=2/3x
B y=9x
C y=2/3x+9
D y=9x+2/3
4. What is an equation in slope-intercept form for the line that passes through the points (1,-3) and (3,1)?
A y=3x+1
B y=x-3
C y=2x+5
D y=2x-5