Which expression can you substitute in the indicated equation to solve.

3x - y = 5

x+2y = 4

A : 2y - 4 for x in 3x - y = 5

B: 4 - x for y in 3x - y = 5

C: 3x - 5 for y in 3x - y = 5

D: 3x - 5 for y in x+2y = 4

The answer is choice D.

Step-by-step explanation:

3x-y=5

+y. +y

3x=y+5

-5. -5

3x-5=y

21.4 i did it already for s1

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: