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MArishka [77]
2 years ago
7

Solve the system using substitution AND elimination: -y + z = -9 y - 5z = 29

Mathematics
1 answer:
dybincka [34]2 years ago
3 0

Answer:

Y=4, Z= -5

<u>Steps:</u>

-y +z = -9 -------(1)

y -5z = 29 ------(2)

from (1):

z = y-9 ------(3)

Substitute (3) in (2)

y - 5(y - 9) = 29

y - 5y +45 = 29

-4y = 29 -45

-4y = -16

Divide both side by ( -4)

y = 4

Use the value y=4 in (1), (2) or (3).

IN (1):

-(4) +z = -9

z = -9 +4

z = -5

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3 years ago
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Using a 16-sided number cube, what is the probability that you will roll a multiple of 4 or an odd prime number? The number 1 is
iogann1982 [59]
<h3>Answer: 0.563 (choice C)</h3>

================================================

Explanation:

E = event space

E = set of outcomes we want to happen

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E = {4,8,12,16     3,5,7,11,13}

n(E) = number of items in set E

n(E) = 9, (four multiples of 16+five ways to roll odd prime number)

-----

S = sample space

S = set of all possible outcomes (whether we want them to happen or not)

S = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}

n(S) = number of items in set S

n(S) = 16

-----

P(E) = probability of event space occurring

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P(E) = n(E)/n(S)

P(E) = 9/16

P(E) = 0.5625

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