(Solved) 4x - 12y = 5, -x + 3 y = -1 Can someone help me with algebra substitution?

datoledo88

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11 years ago

4x - 12y = 5, -x + 3 y = -1 Can someone help me with algebra substitution?

I need more help here like 10x + 2y = 7, y = -5 +3 substitution,
Social Science substition, In a town election, the winning candidate had 220 more votes than the loser. If 810 votes were cast in all, how many votes did each candidate receive?
Geometry: The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 34 in, find the demension of the rectangle.

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juliemandell

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11 years ago

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roblee37

wrote...

11 years ago

4x - 12y = 5
-x +3y = -1

This is a false Q because if u multiply equation 2 by 4 we get

4x - 12y = 5
-4x +12y = -4
-------------------
0=1

Which can't be true

Please verify your sources and stop posting silly Q

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dattallmofo_

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11 years ago

4x - 12y = 5
-x + 3y = -1 { Multiply this one by 4 }

4x - 12y = 5
-4x + 12y = -4 { Add them together }
--------------------
0 = 1

Therefore, this set of equations has no solution. In other words, the two lines are parallel, and never intersect.

10x + 2y = 7
y = -5 + 3 = -2
10x + 2(-2) = 7
10x - 4 = 7
10x = 11
x = 11/10 = 1.1

w = l + 220
w + l = 810
l + 220 + l = 810
2l = 590
l = 295
w = 515

l = 2w + 2
2w = l - 2
2l + 2w = 34
2l + l - 2 = 34 { Substituted "l - 2" for "2w" }
3l = 36
l = 12
w = 5

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