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OpenStudy (anonymous):
How do we transform System A into System B? System A 3x-5y=3 7x-8y=-15 System B 3x-5y=3 x+2y=-21 I just can't figure out what I multiple 7x-8y=-15 by to get x+2y=-21.
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OpenStudy (anonymous):
@johnweldon1993
OpenStudy (amoodarya):
multiply first equation by -2 then add by 2nd equation you will have the answer easy
OpenStudy (amoodarya):
3x-5y=3 7x-8y=-15 multiply by -2 the 1st eq. -6x+10y=-6 so add by 7x-8y=-15
OpenStudy (amoodarya):
3x-5y=3 7x-8y=-15 3x-5y=3 (-6x+10y=-6 ) +(7x-8y=-15 )
OpenStudy (anonymous):
Oh, I was trying to do it completely wrong. Thank you!
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