Solve the system of equations using the substitution method
12x-4y=10
-3x-y=6

Question

Solve the system of equations using the substitution method
12x-4y=10
-3x-y=6

anonymous · Answer

the wolfram alpha thing didn't work on this one:( @misty1212

misty1212 · Answer

put a comma between them

texaschic101 · Answer

look at your 2nd equation....now solve for y

anonymous · Answer

i did

misty1212 · Answer

http://www.wolframalpha.com/input/?i=12x-4y%3D10%2C+-3x-y%3D6 worked for me

anonymous · Answer

ok thanks! I dunno what I did differently

texaschic101 · Answer

-3x - y = 6
-3x - 6 = y

now sub -3x - 6 in for y in the other equation. Then solve for x. Once x is found, sub that back into either equation to find y

anonymous · Answer

I typed that into my homework and it said it was incorrect :(

anonymous · Answer

so -3x - (-3x-6) =6

anonymous · Answer

oh now iget it thereis no solution

texaschic101 · Answer

ok...let me show you
we know that y = -3x - 6
now sub that into your 1st equation
12x - 4y = 10
12x - 4(-3x - 6) = 10
can you finish ?

anonymous · Answer

thanks guys!

anonymous · Answer

the homework things said correct

anonymous · Answer

(-7/12, - 17/4)

anonymous · Answer

so yup no solution, thanks!

texaschic101 · Answer

there is a solution

anonymous · Answer

Yw.

texaschic101 · Answer

@allibricker12  gave the correct solution....(-7/12, - 17/4)