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Sagot :
Answer:
mathematical relationship between two variables that can be expressed by an equation in which one variable is equal to a constant times the other.
8 - direct variation Since the equation can be written in the form y=kx. , y varies directly with x and k. The constant of variation, k, is 3.25
9 - When solving for y, y=5x-9 so y doesn't vary directly with x.
y doesn't vary directly with x
10 - direct variation Since the equation can be written in the form y=kx, y varies directly with x and k. The constant of variation, k, is -2.4
Answer:
- 8 and 10 - yes, 9 - no
Step-by-step explanation:
Direct variation formula:
- y = kx, where k- variation coefficient
#8
- 16.25 = 5*3.25, yes, same format as above
#9
- y = 5x - 9, no, not same format as above
#10
- y = -2.4x, yes, same format as above
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