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3 years ago

15

Find the coordinates of the point 7/10 of the way from A to B.

1 answer:

Artyom0805 [142]3 years ago

5 0

Answer:

(2.6, -2.7)

Step-by-step Explanation:

Let X represent the point which is 7/10 of the way from A to B.

AX to XB = 7:10 = AX/XB = 7/10.

Formula for internal division to find the coordinates is:

$x = \frac{mx_2 + nx_1}{m + n}$

$y = \frac{my_2 + ny_1}{m + n}$

Where,

$A(-4, -8) = (x_1, y_1)$

$B(12, 5) = (x_2, y_2)$

$m = 7, n = 10$

Substitute the values above into the stated formula to find x and y coordinates as follows:

$x = \frac{mx_2 + nx_1}{m + n}$

$x = \frac{7(12) + 10(-4)}{7 + 10}$

$x = \frac{84 - 40}{17}$

$x = \frac{44}{17}$

$x = 2.6$

$y = \frac{my_2 + ny_1}{m + n}$

$y = \frac{7(5) + 10(-8)}{7 + 10}$

$y = \frac{35 - 80}{17}$

$y = \frac{-45}{17}$

$y = -2.7$

The coordinates of the point 7/10 of the way from A to B are (2.6, -2.7)

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a) $x = -1$ and $y = 5$ , b) $x = 2$ and $y = -1$ , c) $x = -2$ and $y = 1$ , d) $x = 2$ and $y = -9$ , e) $x = 2$ and $y = -2$ , f) $x = 2$ and $y = -1$ , g) $x = 2$ and $y = -1$ , h) $x = 1$ and $y = 2$ .

Step-by-step explanation:

Each system is solved as follows (Cada sistema es resuelto como sigue):

a) $2\cdot x + y = 3$ and $3\cdot x - y = -8$

$y = 3 - 2\cdot x$

$3\cdot x - 3 + 2\cdot x = -8$

$5\cdot x = -5$

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b) $x - 2\cdot y = 4$ and $-x+3\cdot y = -5$

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c) $-2\cdot x + 5\cdot y = 9$ and $x - y = -3$

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$3\cdot y = 3$

$y = 1$

$x = -2$

d) $5\cdot x - 4\cdot y = 2$ and $3\cdot x + 2\cdot y = -12$

$3\cdot x + 2\cdot y = -12$

$6\cdot x + 4\cdot y = -24$

$4\cdot y = -6\cdot x -24$

$5\cdot x +6\cdot x +24 = 2$

$11\cdot x = -22$

$x = 2$

$y = -9$

e) $x + y = 0$ and $2\cdot x +3\cdot y = -2$

$y = -x$

$2\cdot x -3\cdot x = -2$

$-x = -2$

$x = 2$

$y = -2$

f) $3\cdot x + 5\cdot y = 1$ and $x + y = 1$

$y = 1 - x$

$3\cdot x + 5 - 5\cdot x = 1$

$-2\cdot x = -4$

$x = 2$

$y = -1$

g) $5\cdot x - 2\cdot y = 12$ and $4\cdot x + 3\cdot y = 5$

$x = \frac{12+2\cdot y}{5}$

$x = \frac{5-3\cdot y}{4}$

$\frac{12+2\cdot y}{5} = \frac{5-3\cdot y}{4}$

$4\cdot (12+2\cdot y) = 5\cdot (5-3\cdot y)$

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Answer:

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Step-by-step explanation:

The total of ratio units is ...

6 + 3 + 8 = 17

The difference between the Charlie's ratio units and Adrian's ratio units is ...

8 - 6 = 2

That is, the total number of ratio units is 17/2 = 8.5 times that difference.

The actual difference is 12 sweets, so the total number of sweets is ...

8.5 × 12 = 102 . . . . total sweets

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