Asked by Nina

Determine the system which is equivalent to the system:

3x+4y=12
x-2y=9

a)
3x+4y=12
3x-6y=27

b)
3x+4y=12
2x-4y=18

c)
10y=-15
5x=30

d)
Any of A,B or C
Answered by Damon
In b, the first equation is unchanged.
In b, the second equation is multiplied by 2, every term, so it is unchanged.
Answered by MathMate
In c, the values of x and y are explicit.
Substitute these values in A and B and see if they work.
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