Question 67740
Solve the system by substitution
(1)              4x - 12y = 5
(2)              -x + 3y = -1 
Thanks for any help you can give me.


(1)              4x - 12y = 5
(2)              -x + 3y = -1 

subtract 3 from both sides of (1) and multiply both sides by -1

(1)              4x - 12y = 5
(2)              x=1+3y

Substitute x=1+3y into (1)

4(1+3y)-12y=5  clear parens
4+12y-12y=5----------------------------------BLOWS APART

Lets look at the slope of Eq (1) and (2)

y=mx+b, where m is the slope

(1)   y=(4/12)x-5/12

(2)   y=(1/3)x-1


These lines have the same slope.  That means that they are parallel.

There's no solution-------------------answer


Hope this helps---------------ptaylor