What is the solution of the system use substitution 3x + 2y equals 7 y =
3 - 3x + 11

x=-21, y=35

Step-by-step explanation:

3x+2y=7   ⇒ 3x+2y=7

y=3-x+11   ⇒ y= -x+14  now we know what y is.

so substitute y for -x+14 and solve the equation:

3x+2(-x+14)=7  

3x-2x+28=7

x=-21  so now we know what x is.

Substitute x into y=-x+14 and you get 35, so x=-21, y=35.

Hope this helped!

d? maybe

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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