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Determine which of the points {(1,-2), (-1,2), (1,2), (-1,-2)}, if any are solutions to the systems of equations {x=4/5y-7 {2x+y=-1

 Jan 6, 2015

Best Answer 

 #1
avatar+118587 
+5

Determine which of the points {(1,-2), (-1,2), (1,2), (-1,-2)}, if any are solutions to the systems of equations {x=4/5y-7 {2x+y=-1

 

I'll test (1,-2)       x=1 and y=-2

x=4/5y-7

1=(4/5)*-2   -7

1=-8/5    -7

This is not true so (1,-2) does not satisfy this system of equations.

 

If it had made the equations true then I would have tested (1,-2) in hte second equation to see if that was true.

If they were both true then the point would have satisfied the system of equations.

You can check th other points.  

 
 Jan 6, 2015
 #1
avatar+118587 
+5
Best Answer

Determine which of the points {(1,-2), (-1,2), (1,2), (-1,-2)}, if any are solutions to the systems of equations {x=4/5y-7 {2x+y=-1

 

I'll test (1,-2)       x=1 and y=-2

x=4/5y-7

1=(4/5)*-2   -7

1=-8/5    -7

This is not true so (1,-2) does not satisfy this system of equations.

 

If it had made the equations true then I would have tested (1,-2) in hte second equation to see if that was true.

If they were both true then the point would have satisfied the system of equations.

You can check th other points.  

 
Melody Jan 6, 2015

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