zain9
zain9
17-12-2016
Mathematics
contestada
what dose 3x-5y=15 and 2x-y=-4 really equel
Respuesta :
RosaT2001
RosaT2001
17-12-2016
The correct answer would be (-5,-6). Hope that helps!
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Tareki
Tareki
17-12-2016
3x - 5y = 15 -----> 1
2x - y = -4 ------>2
multiply eqn2 by -5 and add eqn 1
3x-5y = 15
-10x +5y = 20
--------------------
-7x = 35
x = -5
sub in eqn 2
2(-5) - y = -4
-10 - y = -4
-y = -4+10
-y = 6
y = -6
so the answer is (-5, -6)
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