If the length of the rectangle is x cm, then the width becomes 10 minus x cm because the total perimeter is 20 cm. Therefore, the area of the rectangle is x multiplied by 10 minus x.
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The algebraic expression in Example 1 has separate variables x and y in different terms. But in Example 2, the term 50lw contains two variables multiplied together. Example 2 also represents cost using area and fencing calculations.
After 7 months, the plant height becomes 5.25 feet. The relation between height and months is h = 1.75 + 0.5t. It represents linear growth because the height increases by a constant 0.5 feet every month.
The journey starts with a fixed cost of 100 rupees. The cost increases by 60 rupees for every kilometre travelled. For distances from 0 to 10 km, the costs form a linear growth pattern with constant increase.
Sarita reads 20 pages daily from a 500-page book. In 15 days, she reads 300 pages. Therefore, 200 pages are left. The linear pattern representing remaining pages after n days is 500 minus 20n.