Alake near the arctic circle is covered by a thick sheet of ice during the cold winter months. when spring arrives, the warm air gradually melts the ice, causing its thickness to decrease at a rate of 0.2 meters per week. after 7 weeks, the sheet is only 2.4 meters thick. let y represent the ice sheet's thickness (in meters) after x weeks. complete the equation for the relationship between the thickness and number of weeks. y=

y = 3.8 - 0.2x.

Step-by-step explanation:

y = k  - 0.2x where k is the thickness of the ice before the melting starts and x = the number of weeks.

When x = 7,  y = 2.4 therefore:

2.4 = k - 0.2*7

k = 2.4 + 1.4 = 3.8.

So our equation is y = 3.8 - 0.2x.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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