What is the solution to the system: 9x+3y=24 2y+4x=8

The solution is x = 4 and y = -4

Step-by-step explanation:

(9x + 3y = 24)-2  

(4x + 2y = 8)3

-18x - 6y = -48

12x + 6y = 24

-6x = -24

x = 4

Plug this into one of the equations

2y+4(4)=8

2y + 16 = 8

     - 16     - 16

2y = -8

y = -4

answer: 5

step-by-step explanation:

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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step-by-step explanation: