Mathematics, 26.09.2019 00:30 Zacwn7871

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which ordered pair is the solution to the system of equations?
x+3y=12
-4x+3y=-3
a.
(0, 4)
b.
(6, 2)
c.
(3, 3)
d.
(0, −1)

Answers: 2

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Answer from: lilkit

The answer is c. you use substitution after you find the x, which is 3. To do less work, when u see the answer has an x value of 3, only answer choice c has a x value of 3, limiting it to only that answer.

Answer from: marleacorey

The answer is (3,3). To solve this, first you write the system down.
x+3y=12
-4x+3y=-3
Next, you eliminate y by multiplying the bottom equation by negative 1.
x+3y=12
-1(-4x+3y=-3)

Then, your answer is:
x+3y=12
4x-3y+3
Next, you combine like terms. Your answer is:
5x=15. (The y's cancel out, because 3 is the opposite of negative 3.)
Divide both sides by 5, leaving you with x=3.
Lastly, you substitute x into the top equation. You get:
3+3y=12.
Subtract 3 from both sides, leaving you with 3y=9.
Divide both sides by 3, so y=3. The final answer is (3,3).

Answer from: Quest

step-by-step explanation:

your mom

Which one of these triangle pairs can be mapped to each other using a single refelection

Answer from: Quest

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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