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Title: 4x - 12y = 5, -x + 3 y = -1 Can someone help me with algebra substitution? Post by: datoledo88 on Aug 30, 2012 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. Title: 4x - 12y = 5, -x + 3 y = -1 Can someone help me with algebra substitution? Post by: juliemandell on Aug 30, 2012 Content hidden
Title: 4x - 12y = 5, -x + 3 y = -1 Can someone help me with algebra substitution? Post by: roblee37 on Aug 30, 2012 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 Title: 4x - 12y = 5, -x + 3 y = -1 Can someone help me with algebra substitution? Post by: dattallmofo_ on Aug 30, 2012 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 |