When it says varies directly, it means that y and x are going to be on opposite sides of the equals sign and that there is a constant, k,
y=kx
Plug in (5,100)
100=k(5)
K=20
Answer:

Step-by-step explanation:






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Answer:
(-3,-5)
Step-by-step explanation:
2x=-6
x=-3
24+3y=9
3y=-15
y=-5