SOLUTION: ok, so i have absolutly no clue on what to do with this. write each question as a matrix equation. x + y = 5 x - 2y = -4

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Question 22302: ok, so i have absolutly no clue on what to do with this. write each question as a matrix equation.
x + y = 5
x - 2y = -4
Found 2 solutions by stanbon, kings kid:
Answer by stanbon(48568) About Me  (Show Source):
You can put this solution on YOUR website!
Solved by pluggable solver: Linear System solver (using determinant)
Solve:
+system%28+%0D%0A++++1%5Cx+%2B+1%5Cy+=+5%2C%0D%0A++++1%5Cx+%2B+-2%5Cy+=+-4+%29%0D%0A++

Any system of equations:
+system%28+%0D%0A++++a%5B11%5D%2Ax+%2B+a%5B12%5D%2Ay+=+b%5B1%5D%2C%0D%0A++++a%5B21%5D%2Ax+%2B+a%5B22%5D%2Ay+=+b%5B2%5D%29%0D%0A++

has solution
+system%28+%0D%0A++++x+=+%28b%5B1%5D%2Aa%5B22%5D+-+b%5B2%5D%2Aa%5B12%5D%29%2F%28a%5B11%5D%2Aa%5B22%5D-a%5B21%5D%2Aa%5B12%5D%29%2C%0D%0A++++y+=+%28a%5B11%5D%2Ab%5B2%5D+-+a%5B21%5D%2Ab%5B1%5D%29%2F%28a%5B11%5D%2Aa%5B22%5D-a%5B21%5D%2Aa%5B12%5D%29%0D%0A++++%29%0D%0A++
or

+system%28+%0D%0A++++++x+=+%285%2A-2+-+-4%2A1%29%2F%281%2A-2-1%2A1%29+=+2%2C%0D%0A++++++y+=+%281%2A-4+-+1%2A5%29%2F%281%2A-2-1%2A1%29+=+3%0D%0A++++%29%0D%0A++

(x=2, y=3}


Cheers,
Stan H.

Answer by kings kid(1) About Me  (Show Source):