Solve the system of equations y= -2x y=x²-8

The solutions for the system of equation.

when x = 2 than y = -4

 when x = -4 than y = 8  

Step-by-step explanation:

As given the system of equation

y = -2x

y = x²-8

Put y = -2x  in the equation y = x²-8 .

-2x = x²-8

x² + 2x - 8 = 0

x² + 4x - 2x - 8 = 0

x (x + 4) -2 (x + 4) = 0

(x + 4)(x - 2) = 0

x = 2 , -4

Put x = 2 in the equation y = -2x

y = -2 × 2

y = -4

Put x = -4 in the equation y = -2x

y = -2 × -4

y = 8        

Therefore when x = 2 than y = -4 and  when x = -4 than y = 8 .

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

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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