How do you solve an equotion, with 2 variables? |
 Oct 27 2005, 06:15 PM
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#1
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 Senior Member  Group: Member Posts: 103 Joined: Jul 2004 Member No: 31,102  |
Ah for some reason I can't remember.
I know you can substitute it but I dont' know if I'm doing it right. It's a equiangular triangle and they give the measures of the sides and I know they all equal each other I just can't get x & y 4x -y=7 2x+3y=7 Then I get kinda stuck haha.. can anyone help? You don't have to tell me the answer just like an example or whatever |
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| *mipadi* |
Oct 27 2005, 08:08 PM
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#2
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Choose a variable (let's say x). Now, use one equation to solve for y in terms of x, then subtitute that into the second equation. For example:
4x - y = -7 -y = -7 - 4x y = 7 + 4x 2x + 3(7 + 4x) = 7 2x + 21 + 12x = 7 14x + 21 = 7 Now, just solve like normal. |
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Posts in this topic
doubleaxel1951 How do you solve an equotion Oct 27 2005, 06:15 PM
peggysturr Substitution or elimination. Oct 27 2005, 10:12 PM silver rain You could also multiply the first equation by 3, a... Oct 28 2005, 07:00 AM doubleaxel1951 Okay thanks. this can be closed now Oct 28 2005, 02:45 PM
helllla jankyyyy QUOTE(doubleaxel1951 @ Oct 28 2005, 2:45 PM)O... Oct 29 2005, 12:09 AM swtcherriipie I havent done that in 2 weeks dont remind me calcu... Oct 28 2005, 02:49 PM mipadi QUOTE(swtcherriipie @ Oct 28 2005, 3:49 PM)I ... Oct 28 2005, 03:42 PM crazedbaby X is 2 and Y is 1. Yes sirree. Oct 28 2005, 03:47 PM |
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