7 The system below represents two numbers whose sum is 20 and whose difference is 14.
X + y = 20
x-y=14
2
Solve this system of equations. Remember your solution is an (x, y) pair.
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Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15

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How can constraints be used to model a real-world situation?