SOLUTION: Please help, I'm very frustrated and don't understand how to solve linear systems with substitution. I have a lot of homework due tomorrow and don't understand what I'm supposed to

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Question 192202This question is from textbook Algebra 1
: Please help, I'm very frustrated and don't understand how to solve linear systems with substitution. I have a lot of homework due tomorrow and don't understand what I'm supposed to do.
x-y=0
12x-5y=-21 This question is from textbook Algebra 1

Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
A) x-y=0
B) 12x-5y=-21
.
A) x=y
B)
12y-5y=-21 substitute y for x.
7y=-21
y=-3
x=-3
.
Ed