Question

4. Suppose y varies directly with x, and y=24 when x=8. What is the value of y when x=10? (1 point)

A. 10
B. 30
C. 80
D. 240



5. What is an equation for the line with the slope 2/3 and y-intercept 9? (1 point)


A. y= 2/3x
B. y= 9x
C. y= 2/3x +9
D. y= 9x +2/3


6. What is an equation in slope-intercept form for the line that passes through the points (1, -3) and (3, 1)? (1 point)


A. y=3x +1
B. y= x- 3
C. y= 2x +5
D. y= 2x -5

Answer 1

y = kx

Answer 2

24 = k8
k = 3
y = (8)10
y = 80

Answer 3

4. direct variation: y = kx . K is the constant of variation, so solving for k, we get, k = y/x.

You're given y = 24 and x = 8, plugging these in:

k = 24/8 = 3

Now we're asked for y = kx when x= 10

y = 3(10) = ?

Answer 4

@dmndlife24 you solved for k and got 3 but plugged in 8 for k.

Answer 5

2. y = mx +b