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Mathematics 22 Online
OpenStudy (anonymous):

y > 4x -5 A. (3,4) B.(2,1) C.(3,0) D.(1,1)

OpenStudy (anonymous):

which ordered pair os a solution of the inequality ?

OpenStudy (phi):

"test" each (x,y) pair. For example, to test choice A (3,4) let x= 3 (the first number in (3,4) ) and put 3 into the relation in place of x y > 4x -5 y > 4*(3) - 5 remember order of operations: first do 3*4=12 then 12-5 to get 7 y>7 finally, select the 2nd number from (3,4) to get the y value of 4. put that into our expression 4 > 7 is that true ? no. 4 is not bigger than 7 (notice the "big" side of > should be next to the bigger number and the "small" side of > next to the small number) all of that means choice A does not work

OpenStudy (phi):

can you test the other choices ?

OpenStudy (anonymous):

I think that the correct answer is D>^

OpenStudy (phi):

For (1,1) did you "put in" 1 for x in y > 4x -5 ? you should get y > 4*1 - 5 y> 4-5 y> -1 now replace y with the 2nd number in (1,1) 1 > -1 is 1 bigger than -1. yes. so choice D is correct

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