In each case below a relation between set S and set T is described. In each case explain why the relation is not a function from the set S to the set T. (a) S is the set of ordered pairs of integers (Z×Z) and T = Q is the set of rational numbers. An ordered pair of integers s = (n, m) and a rational number t are related if t = n/m. (b) S is the set of all California license plates in California and T = N. A license plate s ∈ S is related to t ∈ N when t is the smallest number that appears in the license plate number on s. (c) S = R is the set of real numbers and T is the set of ordered pairs of real numbers (R×R). A real number s is related to the ordered pair of real numbers t = (x, y) if s = x + y.

1/800 is the right answer

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

hey there! : )

4y < -4

we need to isolate y. we can do this by simply dividing both sides by 4.

4y ÷ 4 > -4 ÷ 4

simplify.

y > -1

5 - y > 0

once again, we need to isolate y, so we can start off by subtracting 5 from both sides.

5 - y - 5 > 0 - 5

simplify.

-y > -5

divide both sides by -1.

** remember that when dividing any side by a negative, you must switch the sign! **

-y ÷ -1 < -5 ÷ -1

simplify.

y < 5

~hope i ! ~

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