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Mathematics 7 Online
OpenStudy (anonymous):

If y is -15 when x is 3, find x when y is -20

OpenStudy (saifoo.khan):

use ratio method. cross multiply them!

OpenStudy (anonymous):

4?

OpenStudy (saifoo.khan):

x : y 3: -15 x : -20

OpenStudy (saifoo.khan):

x = 4

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