Seudónimo
Seudónimo
20-01-2016
Mathematics
contestada
number 21 please and how to do it step by step
Respuesta :
naccy
naccy
20-01-2016
-4y+5x=8
3y-3x=-3 --> divide by (3) y-x=-1
then multiply by (4) 4y-4x=-4
-4y+5x=8
4y-4x=-4
---------------
x=4
then plug x=4 in
4y-4x=-4
4y-4(4)=-4
4y-16=-4
4y=12
y=3
solution: (4;3)
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