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ehidna [41]
3 years ago
5

Line k passes through the point (1, 5) and is perpendicular to the line y = 3x + 1. Which of the following points does line k al

so pass through?
Select one:
A. (4, 4)
B. (-2, -5)
C. (3, 6)
D. (9, -1)
Mathematics
1 answer:
bearhunter [10]3 years ago
6 0

Answer:

Option A. (4,4)

Step-by-step explanation:

step 1

Find the slope of the line k

we know that

If two lines are perpendicular, then the product of their slopes is equal to -1

m1*m2=-1

The slope of the given line is m1=3

so

The slope of the line k is

m2*(3)=-1

m2=-\frac{1}{3}

step 2

Find the equation of the line k

The equation of the line into point slope form is equal to

y-y1=m(x-x1)

we have

m=-\frac{1}{3}

point(1,5)

substitute the values

y-5=-\frac{1}{3}(x-1)

step 3

Verify if the line k pass through the given points

Remember that

If the line passes through a point, then the value of x and the value of y of the point must satisfy the equation of the line

Verify each case

case A) (4,4)

4-5=-\frac{1}{3}(4-1)

-1=-\frac{1}{3}(3)

-1=-1 ----> is true

therefore

The line k pass through the point (4,4)

case B) (-2,-5)

-5-5=-\frac{1}{3}(-2-1)

-10=-1 -----> is not true

therefore

The line k not pass through the point (-2,-5)

case C) (3,6)

6-5=-\frac{1}{3}(3-1)

1=-\frac{2}{3} -----> is not true

therefore

The line k not pass through the point (3,6)

case D) (9,-1)

-1-5=-\frac{1}{3}(9-1)

-6=-\frac{8}{3} -----> is not true

therefore

The line k not pass through the point (9,-1)

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Step-by-step explanation:

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Alex73 [517]

Answer:

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Pete saves 4/5 of his wages each week.If he earns 150$ per week. How much did he save ?
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Answer:

m∠CBD = m∠CDB ⇒ proved

Step-by-step explanation:

Let us solve the question

∵ AB ⊥ BD ⇒ given

→ That means m∠ABD = 90°

∴ m∠ABD = 90° ⇒ proved

∵ ED ⊥ BD ⇒ given

→ That means m∠EDB = 90°

∴ m∠EDB = 90° ⇒ proved

∵ ∠ABD and ∠EDB have the same measure 90°

∴ m∠ABD = m∠EDB ⇒ proved

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→ Equate the two right sides

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∵ m∠ABC = m∠EDC ⇒ given

→ That means 1 angle on the left side = 1 angle on the right side, then

   the other two angles must be equal in measures

∴ m∠CBD = m∠CDB ⇒ proved

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