Seed Problem: The height of an amazing plant grown from a seed varies linearly with the time it has been in the ground. After six days it is 6cm tall and after 60 days it is 15.8m (1580 cm) tall.
If y is the height of the plant and x is the time the seed has been in the ground then the problem says that y varies linearly with x. That means that for some numbers a and b, y = ax + b. Since y=6 cm when x=6 days, 6=6a+b. Also since y=1580 cm when x=60 days, 1580=60a+b. This gives you two equations for a and b,
You should now be able to solve these equation to find a and b which gives the equation required in part 1.
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