SOLUTION: Solve the following by substitution: x + y = 0, 3x + 3y = 4. What are the slopes of the above lines ? Change the second equation in problem 1 to 3x + 2y = 4. Solve by su

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Question 351985: Solve the following by substitution: x + y = 0, 3x + 3y = 4.
What are the slopes of the above lines ?
Change the second equation in problem 1 to 3x + 2y = 4. Solve by substitution.

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.x+%2B+y+=+0
2.3x+%2B+3y+=+4
From eq. 1,
x=-y
Substitute into eq. 2,
3%28-y%29%2B3y=4
0=4
Since your equations lead to an inconsistency, there is no solution.
The lines are parallel.
The slope of eq. 1 is m=-1
3x%2B3y=4
3y=-3x%2B4
y=-x%2B4%2F3
The slope of eq. 2 is m=-1.
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1.x+%2B+y+=+0
2.3x+%2B+2y+=+4
From eq. 1,
x=-y
Substitute into eq. 2,
3%28-y%29%2B2y=4
highlight%28y=4%29
Then from eq. 1,
highlight%28x=-4%29
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