Posted by **Nina** 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) -
**Damon**, 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) -
**MathMate**, 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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