Question 140352
9x+4y=-17-----------------eq1
12y=-3-3x -----------------eq2

divide each term in eq2 by 3

4y=-1-x--------------------eq2a

Now substitute 4y=-1-x from eq2a into eq1:

9x-1-x=-17  add 1 to each side

9x-1+1-x=-17+1  collect like terms

8x=-16  divide each side by 8
x=-2--substitute this into eq2a

4y=-1+2=1 divide each side by 4

y=1/4

CK
From eq1:
9*(-2)+4(1/4)=-17
-18+1=-17
-17=-17
From eq2a
4(1/4)=-1+2
1=1


Hope this helps---ptaylor