Find the coordinates of P(a, b) whose ordinate is twice as much as abscissa and sum of coordinates is -12.

P(- 4, - 8 )

Step-by-step explanation:

The abscissa is the x- coordinate and the ordinate is the y- coordinate.

Here b = 2a , thus

a + 2a = - 12

3a = - 12 ( divide both sides by 3 )

a = - 4

and b = 2a = 2 × - 4 = - 8

P(- 4, - 8 )

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4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80