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ALGEBRA HELP PLEASE

Solve using the substitution method
3x-9y=3
6x-3y=-24
please show work

User Kaushikdr
by
8.2k points

1 Answer

1 vote
Start by solving for x in the first problem:
3x=3+9y
x=1+3y
Then plug that into the second equation:
6(1+3y)-3y=-24
6+18y-3y=-24
15y=-30
y=-2
Then plug that back into first equation:
3x-9(-2)=3
3x+18=3
3x=-15
x=-5
Then I would check your answer by plugging those into both equations:
3(-5)-9(-2)=3
-15+18=3
3=3 CHECK
6(-5)-3(-2)=-24
-30+6=-24
-24=-24 CHECK

So the answer is x=-5 y=-2

User Samuel Seda
by
7.9k points

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