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Edited by PINGASMASTERLOL:
5/12/2013 3:31:27 AM
6
Solving Linear equations ... pls help flud
Just need a quick question answered flood, in solving a linear equation by substitution are the variables always going to be equal to zero? Sometimes I see them go as one when solving, it always confuses me because I can't tell when to use zero or one. Or put it this way, is Y & X always equal to zero?
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1 ReplyEdited by lVlzone: 5/12/2013 4:16:16 AMYou need to use one equation in order to solve for the other. Here's an example x+y=20 x-y=10 Now, solve for one of the variables in either equation. It does not matter which. x-y=10 Add y to both sides in order to cancel it out. x=10+y Now, plug "10+y" in for the x variable in one of the first two equations in order to find y. x=y=20 The original 10+y+y=20 This is what it would look like after plugging in x. Now, combine like terms. 10+2y=20 Next, cancel out the 10 by subtracting it from both sides. 2y=10 Now cancel out the 2 by dividing each side by two. y=5 You will now plug "5" in for why in one of the original formulas. x+y=20 The original x+5=20 After plugging in "5" for y. Now cancel out the 5 by subtracting 5 from each side. x=15 Now your answer is (15,5)
