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Mathematics 15 Online
OpenStudy (anonymous):

Which equations are equations for the line shown? Choose all answers that are correct. A. y+3=-2(x -2) B. y+2=2(x -5) C. y-5=-2(x+2) D. y-2=-2(x+3) I think C is one of the correct answers, but I'm not sure about the others

OpenStudy (anonymous):

jimthompson5910 (jim_thompson5910):

(-2,5) and (2,-3) are on this line

jimthompson5910 (jim_thompson5910):

so (x,y) = (-2,5) and (x,y) = (2,-3) should BOTH make the equation true

jimthompson5910 (jim_thompson5910):

let's test choice C

jimthompson5910 (jim_thompson5910):

testing (-2,5) y-5=-2(x+2) 5-5=-2(-2+2) ... plug in (x,y) = (-2,5) 0 = -2(0) 0 = 0 ... so that works for (-2,5) ----------------------------- testing (2,-3) y-5=-2(x+2) -3-5=-2(2+2) ... plug in (x,y) = (2,-3) -8 = -2(4) -8 = -8 ... that works as well

jimthompson5910 (jim_thompson5910):

so that confirms choice C is one of the answers

jimthompson5910 (jim_thompson5910):

I'll let you check the others

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