Use the linear combination method to solve the system of equations. explain each step of your solution.

-4x + 9y = 9
x - 3y = -6

x=9 y=5

Step-by-step explanation:

Let -4x+9y=9 be function 1 while x-3y=-6 be function 2

function 1 plus  4 times function 2

-4x+4x+9y-12y=-15

Simplify

-3y=-15

Divide each side by -3

y=5

Substitude y=5 into function 2

x-3(5)=-6

x-15=-6

add 15 to each side

x=9

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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i wish i could you, i have no idea how to answer this

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