Use substitution to solve the system of equations.

y = 2x + 16
2x – 7y = –64

A) (–4, 8)

B) (–1, 11)

C) (8, –4)

D) (–7, –11)

A)  (–4, 8)

Step-by-step explanation:

to solve this system of equation

we will say let

y = 2x + 16 equation 1

2x – 7y = –64 equation 2

substitute equation 1 into equation 2

2x – 7y = –64 equation 2

2x - 7( 2x + 16) = -64

2x - 14x -112 = -64

combine the like terms

2x - 14x = -64 +112

-12x = 48

divide both sides by the coefficient of x

-12x/-12 = 48/-12

x = -4

put the value of x = -4 into equation 1

y = 2x + 16 equation 1

y = 2(-4) + 16

y = -8 + 16

y = 8

therefore the value of x and y is -4 and 8 respectively

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: 4 cause 2+2=4