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Volgvan
2 years ago
10

The equation of the tangent to the circle at A(1,8) is 3x-2y+5=0 and its centre is on the line 7x+3y-1=0 . Find the centre of th

e circle
Mathematics
1 answer:
klasskru [66]2 years ago
3 0

Step-by-step explanation:

Use the standard form to write two equations using points A and B:

(

−

2

−

h

)

2

+

(

0

−

k

)

2

=

r

2

(

5

−

h

)

2

+

(

1

−

k

)

2

=

r

2

Because

r

2

=

r

2

, we can set the left sides equal:

(

−

2

−

h

)

2

+

(

0

−

k

)

2

=

(

5

−

h

)

2

+

(

1

−

k

)

2

Expand the squares using the pattern

(

a

−

b

)

2

=

a

2

−

2

a

b

+

b

2

4

+

4

h

+

h

2

+

k

2

=

25

−

10

h

+

h

2

+

1

−

2

k

+

k

2

Combine like terms (noting that the squares cancel):

4

+

4

h

=

25

−

10

h

+

1

−

2

k

Move the k term the left and all other terms to the right:

2

k

=

−

14

h

+

22

Divide by 2

k

=

−

7

h

+

11

[1]

Evaluate the given line at the center point:

2

h

+

k

−

1

=

0

Write in slope-intercept form

k

=

−

2

h

+

1

[2]

Subtract equation [2] from equation [1]:

k

−

k

=

−

7

h

+

2

h

+

11

−

1

0

=

−

5

h

+

10

h

=

2

Substitute 2 for h in equation [2]

k

=

−

2

(

2

)

+

1

k

=

−

3

Substitute the center

(

2

,

−

3

)

into the equation of a circle using point A and solve for the value of r:

(

−

2

−

2

)

2

+

(

0

−

−

3

)

2

=

r

2

(

−

4

)

2

+

3

2

=

r

2

r

2

=

25

r

=

5

Substitute the center

(

2

,

−

3

)

and #r = 5 into the general equation of a circle, to obtain the specific equation for this circle:

(

x

−

2

)

2

+

(

y

−

−

3

)

2

=

5

2

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Step-by-step explanation:

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===============================================================

Work Shown:

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10% of 1000 = 0.10*1000 = 100 is the amount of interest earned in year 1. This goes in the first row of column 1. The overall balance becomes 1000+100 = 1100 after we add on the interest earned. We will write 1100 in row1,column2.

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After finishing row1, we should have these four values: 100, 1100, 30, 1070

----------------------------------------------

Now onto row 2

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The overall balance will be different. Instead of using 1000, we will use 1070 which was the figure in row1,column4. Add the amount of interest earned ($100) onto the updated balance ($1070) to get 1170. Write 1170 in row2,column2

The value in row2,column3 is the same as the value above it. This is because the amount of interest does not change, so the amount taxed doesn't change either. Basically we'll have 30s all the way down column 3. We'll also have 100s all the way down column 1.

Subtract 1170 and 30 to get 1140 which is the balance after taxes for year 2.

------------------------------------------------

Repeat these steps for the third, fourth, and fifth rows and you'll get what you see in the table below.

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