what is 3x+4y=12 and 1x+4y=9

Mathematics
Tutor: None Selected Time limit: 1 Day

show work clearly please

Mar 29th, 2015

MULTIPLY SECOND BY 3

3x+12y=27

3x=27-2y

substitute in first

27-2y+4y=12

2y=-15

y=-15/2=-7.5........ANSWER

now in second equation substitite y

x+4*-7.5=9

x=9+30

x=39................ANSWER



Mar 29th, 2015

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