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elimination . please help

Algebra
Tutor: None Selected Time limit: 1 Day

solve the following system of equations using elimination

4x - 2y =8

3x - 9y = -54

Jul 1st, 2014


To use Elimination method we need to make coefficients of one variable equal and opposite.

Here we can choose X to do this, so :

3(4x - 2y = 8) =>      12X - 6Y = 24

-4(3x - 9y = -54) => -12X +36Y = 216

Now we add corresponding sides of both equations and we get => 30Y = 240 => Y = 8

Now we substitute Y=8 in any one equation and we get => 4X - 2(8) = 8 => X = 6

So the solution is ( 6,8)

Hope this helps.

If it does please give tip.

Thanks.

Jul 2nd, 2014

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