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

Question

A. 10

B. 30**

C. 80

D. 240

2. 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**

Answer 1

1. yes, y = 3 x so y = 30 when x = 10

2. slope = m = (1+3)/(3-1) = 2
so
y = 2 x + b
put a point in
1 = 2*3 + b
b = -5
so
y = 2 x - 5 agree

Answer 2

Thanks for the help