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Mathematics 13 Online
OpenStudy (chris911):

HELP!!!!!!! When triangle XYZ where X (-4,-3), Y (6, -1), and Z (7, 8) is rotated 90º clockwise about the origin, what is the new location? A. triangle X'Y'Z' where X' (-3, 4), Y' (-1, -6), and Z' (8, -7) B. triangle X'Y'Z' where X' (-3, -4), Y' (-1, 6), and Z' (8, 7) C. triangle X'Y'Z' where X' (3, - 4), Y' (1, 6), and Z' (-8, 7) D. triangle X'Y'Z' where X' (3, 4), Y' (1, -6), and Z' (-8, -7) ???

OpenStudy (anonymous):

A, because each section is moved so the numbers are switched and one of them becomes negative due to its aproximate possition, it helps to draw it out

OpenStudy (chris911):

thanks can u help with another one?

OpenStudy (anonymous):

sure go ahead

OpenStudy (anonymous):

remember to try and draw it out yourself and i can check your answer

OpenStudy (chris911):

ok If triangle ABC is reflected across line m, where will the new coordinates be located? A. A’(-2, 4); B’(-7, 8); C’(2, 8) B. A’(7, -8); B’(2, -4); C’(-2, -8) C. A’(2, -4); B’(-2, -8); C’(7, -8) D. A’(2, -4); B’(7, -9); C’(-2, -9)

OpenStudy (chris911):

is it C?

OpenStudy (anonymous):

sorry no, try referencing another point, if you know that point A will be in (2,-4) try looking for c, you already have it narrowed down to two answers

OpenStudy (anonymous):

or rather if the answer is not C, check the location of any point because they are all different but i would recomend re checking A, if you thought that the answer was C

OpenStudy (chris911):

yep I think its A

OpenStudy (anonymous):

okay the answer is D.... but what you need to do is count the amount of squares each point is straight down from line M, and then from line M, count out that same amount to get the final location of (x,y) x is already given to you and will not change if you reflect horizontally

OpenStudy (anonymous):

so if A is one away from m, then when you get to m you count one more and then the location of point A is (2,-4) now you try with a different point

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