Hi,

Note: Post each question separately, not necessary to use pictures,

just list Eqs with the following instructions:

Solve the system of equations by using the inverse of the coefficient matrix.

 x+3y = -9 

5x+8y = -31                             

 = -7  

  Note: How the above numbers flipped and the 2 minuses

 = (1/-7)





and...



Ordered pair (-3,-2) the solution for this system of equations

Checking our answer using the Elimination Method:

x+3y= -9 

5x+8y= -31  |multiplying 1st EQ by 5 and Subtracting  from the 2nd EQ

 -7y = 14

  y = -2   and x = -3  as 

(x,y) Ordered pair (-3,-2) the solution for this system of equations 

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