Anonymous Anonymous

19-01-2016
Mathematics

Answered

number 21 please and how to do it step by step

number 21 please and how to do it step by step class=

Verified Answer :

19-01-2016

-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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