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.
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In the algebraic expression 200l + 160w + 50lw, the terms are 200l, 160w and 50lw. The variables are l and w. The coefficients are 200, 160 and 50. There is no constant term in this expression.
After 3 years, the phone value becomes 7600 rupees. The relation between value and years is v = 10000 minus 800t. It represents linear decay because the value decreases by a fixed 800 rupees every year.
The water level starts at 3 metres and decreases by 0.5 metre every month. After each month, the height reduces regularly. This forms a linear decay pattern because the decrease remains constant with time.
The volume of a rectangular box is length multiplied by breadth multiplied by height. The volumes are 385 cubic cm, 693 cubic cm and 1001 cubic cm respectively. The linear pattern representing the volume is 77h.