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4 years ago

The sum of two numbers is 8, and their difference is 22

Mathematics

1 answer:

lawyer [7]4 years ago

8 0

Answer:

15, -7 x=15 y=-7

Step-by-step explanation:

x+y=8, we'll come back to this

x-y=22, move y to the other side, x=y+22

now insert the value of x =(y+22) to the other equation like so, (y+22)+y=8, simplify

2y+22=8 2y=(-14), y=(-7)

Insert the value of y into the first equation again like so, x+(-7)=8, simplify

x=15

15, -7

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3 years ago

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masya89 [10]

Let

$P=(P_x,P_y),\quad Q=(Q_x,Q_y)$

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We can solve this expression for the coordinates of Q:

$M_x = \dfrac{P_x+Q_x}{2} \implies Q_x = 2M_x-P_x$

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Plug in the values for the coordinates of M and P to get

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Step-by-step explanation:

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