solve by the substitution method 7x+3y=-17 and x =19-4y. is there a solution or not?

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Asked 3/18/2012 4:11:53 PM

Updated 3/22/2015 3:31:15 AM

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Flagged by Andrew. [3/22/2015 3:31:15 AM]

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User: solve by the substitution method 7x+3y=-17 and x =19-4y. is there a solution or not?

Question

Asked 3/18/2012 4:11:53 PM

Updated 3/22/2015 3:31:15 AM

1 Answer/Comment

Flagged by Andrew. [3/22/2015 3:31:15 AM]

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Andrew.

7x + 3y = -17
x = 19 - 4y;

7(19 - 4y) + 3y = -17;
133 - 28y + 3y = -17;
133 - 25y = -17;
-25y = -17 - 133;
-25y = -150;
y = -150/-25;
y = 6;
x = 19 - 4(6);
x = 19 - 24;
x = -5;
The solution set is (-5, 6).

Added 3/22/2015 3:31:14 AM

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