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Home Q & A Board Science-Related Homework Help Mathematics
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meloney meloney
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9 years ago
I need help with math 110 equation and graphing pleasze help
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#1
Valued Member
On Hiatus
9 years ago
You need the solution of the system?
3x+y=-5
3x-y=-1


First, you take one equation and solve as for one variable (for example y)
3x+y=-5 <=> y=-5-3x

Then you replace the variable to the other equation:
3x-y=-1 <=> 3x-(-5-3x)=-1 <=> 3x +5+3x=-1 <=>6x+5=-1 <=>6x=-6 <=> x=-1

Then, you use either of the equations, and you replace x with -1:
3x+y=-5 <=> 3*(-1)+y=-5 <=> -3+y=-5 <=> y=-2

So, the solution is (x,y)=(-1,-2)


Want more explanation?
wrote...
#2
9 years ago
go with what alexx said that's prety straightfoward
Post Merge: 9 years ago
wrote...
#3
Educator
9 years ago
Quote from: screwbiologyfor (9 years ago)
go with what alexx said that's prety straightfoward
Post Merge: 9 years ago



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