4. Which line is perpendicular to y = 2x – 8?

Step-by-step explanation:

If a line is perpendicular to another line , their gradients when multiplied should be equal to -1.

Here the gradient = 2

so if the gradient of the perpendicular is m

m × 2 = -1

so m = -1/2

now lets find a point on y = 2x – 8

suppose if x = 1

y = -8 + 2 = -6

point ---> (1,-6)

now lets find the perpendicular,

(y -y')/ (x-x') = -1/2

[y - (-6)] / (x - 1) = -1/2

2 (y + 6) = -1 (x-1)

2y + 12 = -x+ 1

2y = -x - 11

y = -1/2x -11/2

I hope this helps ya. Fighting!!

step-by-step explanation:

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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