Identify the coordinates of (3, –9) after a rotation of 180° about the origin.

1 answer:

7 0

Answer: (-3,9)

When we rotate 180 degrees about the origin, the rule is (x,y) --> (-x,-y). The coordinate signs have swapped. If x is negative, then x turns positive, or vice versa. The same applies for y as well.
x = 3 becomes -x = -3
y = -9 becomes -y = -(-9) = 9

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Answer:

y = -3/2x + 6

Step-by-step explanation:

Parallel lines have the same slope so slope is -3/2

Using (4,0)

y = mx + b

0 = -3/2(4) + b

0 = -6 + b