Homework Help: Math

Posted by Izzy. on Wednesday, January 4, 2012 at 10:31pm.

I SERIOUSLY need help!

Solve the linear system by using substitution.
x=6-4y
2x-3y=1

Explanation too, please!
Please and thanks!

Math - Reiny, Wednesday, January 4, 2012 at 10:44pm
very very easy

sub x = 6-4y into
2x - 3y = 1
2(6-4y) - 3y = 1
12 - 8y - 3y = 1
-11y = -11
y = 1

then x = 6 - 4(1) = 2
Math - Izzy., Wednesday, January 4, 2012 at 10:48pm
Thank you, but:
How did you go from 12-8y-3y to -11y?
Math - Reiny, Wednesday, January 4, 2012 at 10:56pm
12 - 8y - 3y = 1
12 - 11y = 1 , that should be clear
12 -12 - 11y = 1 -12
-11y = -11
divide by -11
y = 1
Math - Izzy., Wednesday, January 4, 2012 at 11:23pm
Understood. Thank you.

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