anonymous
  • anonymous
Write the coefficient matrix of the system. Use it to decide if the system has a unique solution. -x-5y=-8 -7x+4y=4
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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experimentX
  • experimentX
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experimentX
  • experimentX
for unique solution, if the determinant of the right hand matix exist, then you have unique solution
anonymous
  • anonymous
How do you get the determinant?

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anonymous
  • anonymous
the determinat is of a 2x2 matrix is given by ad-bc, now if it is non zero determinat it has a unique solution
anonymous
  • anonymous
So the answer is -1 -5 -7 4 and yes it is a unique solution?
experimentX
  • experimentX
for 2xx matrix see here .. it's clearly given here http://en.wikipedia.org/wiki/Determinant#2-by-2_matrices

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