SOLUTION: I am having a lot of trouble with these three problems. Please help? Solve by elimination/substitution. 12x + 13y = 491 12x + 19y = 629 3x � 4y = -198 x � 3y = -111 x + 2y

Question 707820: I am having a lot of trouble with these three problems. Please help? Solve by elimination/substitution.
12x + 13y = 491
12x + 19y = 629
3x � 4y = -198
x � 3y = -111
x + 2y = 47
x - 3y = 7
Answer by checkley79(3341) (Show Source): You can put this solution on YOUR website!
12x + 13y = 491
12x + 19y = 629 SUBTRACT.
-------------------------
-6y=-138
y=-138/-6
y=23 ans.
12x+13*23=491
12x+299=491
12x=491-299
12x=192
y=192/12
y=16 ans.
##########
3x � 4y = -198
x � 3y = -111 multiply by -3 & add.
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x + 2y = 47
x - 3y = 7 subtract.
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