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Posted by on Saturday, July 25, 2009 at 2:39pm.

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

  • Systems (maths) - , Saturday, July 25, 2009 at 4:22pm

    In b, the first equation is unchanged.
    In b, the second equation is multiplied by 2, every term, so it is unchanged.

  • Systems (maths) - , Saturday, July 25, 2009 at 5:20pm

    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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