How do you find the image of a point under a 270degree?

[isu23pink]

How do you find the image of a point under a 270degree rotation about the origin?

for example on these points:
1. (-3,-1)
2. (-4,5)
3. (7,-2)
4. (7,2)
5. (1,1)
6. (-1,-3)

?

this is what i got for the answers:
1. (0,-4)
2. (0,1)
3. (4,-5)
4. (4,-1)
5. (-1,-1)
6. (-2,-6)

not sure if they seem right....

 

[akoaysigod]

point (a,b) goes to (b, -a), then you just plug in numbers. (3,0) is really (0, -3) etc. You can always draw it on graph paper and spin it around.