Solve using the elimination method:
3x + 2y +z = 14
6x + 2y + 6z = 38
x + 2y + z = 18

x=-2, y=7, and z=6

Step-by-step explanation:

3x + 2y +z = 14

6x + 2y + 6z = 38

x + 2y + z = 18

Take the first and subtract the third.

2x = -4

x = -2

Now the equations become.

2y + z = 20 (both the first and third)

2y + 6z = 50

Subtract the first from the second.

5z=30

z=6

Substitute back.

2y + 6(6) = 50

2y = 14

y=7

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

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step-by-step explanation: