4x+3y=2

-x+7y=15

.

this is where im getin confused. do i need to find the inverse matrix then multiply out to get answer? im geting very big values(Worried)

many thanks

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- March 1st 2010, 04:43 AMdecoy808solve Matrices simultaneously
4x+3y=2

-x+7y=15

.

this is where im getin confused. do i need to find the inverse matrix then multiply out to get answer? im geting very big values(Worried)

many thanks - March 1st 2010, 05:06 AMsa-ri-ga-ma
Your method is correct. Proceed.

- March 1st 2010, 07:53 AMHallsofIvy
However, writing makes it look like a fraction!

What you mean is

so

Since the determinant of that is 4(7)- 3(-1)= 28+ 3= 31, you should NOT have very large numbers! You should have fractions with 31 in the denominator.