Question 201869
5x-6y=-6
5x+51=y
5x-6(5x+51)=-6
5x-30x+306=-6
25x-300
x=-12,

Ok, all of the above is correct! :-)  Good for you.  Now you need to "plug" the -12 into your equation and that's where you made your mistake......

you had......


y=5x+51   <------this is correct.....


=-56+51   <------this is not correct. It should be:  

y = 5(-12) + 51  (See where I "plugged" in the -12 for the "x" variable?

SOOOO now you solve:

y= 5(-12) +51   

y= -60  + 51   (5 times -12 equals -60)
y= - 9         (-60 + 51 gives you -9)


Did that help?  I hope so!

:-)