SOLUTION: I had to use the substitution method to solve 9x+5y=-18 and -3x+y=30. After using the substitution method I came up with the order pair (-7, 9). My problem is, how do I figure out

Algebra ->  Linear-equations -> SOLUTION: I had to use the substitution method to solve 9x+5y=-18 and -3x+y=30. After using the substitution method I came up with the order pair (-7, 9). My problem is, how do I figure out       Log On


   

Question 478434: I had to use the substitution method to solve 9x+5y=-18 and -3x+y=30. After using the substitution method I came up with the order pair (-7, 9). My problem is, how do I figure out if the solution to this system is consistent or inconsistent?
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
Substitute x=-7, y=9 into the system, if both equations will be correct equalities - so the solution to this system is consistent
system%289%2A%28-7%29%2B5%2A9=-18%2C-3%2A-7%2B9=30%29
system%28-18=-18%2C30=30%29correct, so the solution to this system is consistent