B. Find an equation where y varies directly as x. 1. y = 28 when x = 7 2. y 30 when x = 8 3. y = 0.7 when x = 0.4 4. y = 0.8 when x = 0.5 5. y 400 when x = 125 6. y = 630 when x = 175 = 7. y = 200 when x = 300 8. y = 1 and x = 2 9. y = 48 and x = 6 10. y 10 and x = 24​