Linear equation
2006-07-23 12:29:10 · 11 answers · asked by joinerd@sbcglobal.net 1 in Science & Mathematics ➔ Mathematics
Y=2x+3
3x+y=-17
3x+2x+3= -17
5x+3= -17
-3 -3
5x= -20
5 5
X=-4
Now put x in the y='s equation. You will find y. :)
Hope that helps!
2006-07-23 12:37:10 · answer #1 · answered by starmoonpm 2 · 0⤊ 0⤋
y = 2x + 3 and 3x+y = 17
substituting the value of y in the second equation we get
3x +2x+3 = 17
5x = 17 - 3 = 14
x = 14/5 or 2 4/5
y = 2x+3 = 2(14/5)+3 = 28/5 + 3 = (28 + 15)/5 = 43/5 = 8 3/5
hence, x 14/5 and y = 43/5
2006-07-24 00:38:00 · answer #2 · answered by Subhash G 2 · 0⤊ 0⤋
Since the 1st equation is already solved for y, substitute the result into the 2nd equation
3x + 2x + 3 = -17
5x = -20
x = -4
Put this value for x into the 1st equation
y = 2(-4) + 3
y = -8 + 3
y = -5
To check, put your answers into the 2nd equation
3(-4) + (-5) = -17
-12 - 5 = -17
-17 = -17
2006-07-23 19:37:40 · answer #3 · answered by kindricko 7 · 1⤊ 0⤋
It seems that one merely ignores the long part between the two equal signs and that leaves y=-17. The middle portion is not written correctly to be in an equation. It needs parentheses to make any sense, i.e. (2x+3)(3x+y)...but why bother with it at all? Just skip it and see it equals -17. One gets a messy 2xy if he expands the equation as I've written it. No need for it!!!
2006-07-23 19:47:32 · answer #4 · answered by miyuki & kyojin 7 · 0⤊ 0⤋
x=-4
y=-5
2006-07-23 19:44:46 · answer #5 · answered by noelliedel 1 · 0⤊ 0⤋
x= -4, y= -5
2006-07-23 19:36:06 · answer #6 · answered by someone in the world 4 · 0⤊ 0⤋
easy:
y = 2x + 3 ---------------- 1
3x + y = -17 --------------- 2
substitute 1 into 2:
3x + (2x + 3) = -17
5x + 3 = -17
5x = -17 - 3
5x = -20
x = -20 / 5
x = -4
substitute into any equation [let's do 1]:
y = 2x + 3
y = 2(-4) + 3
y = -8 + 3
y = -5
therefore,
x = -4
y = -5
[check it yourself]
2006-07-23 19:45:14 · answer #7 · answered by wilde.reader 2 · 0⤊ 0⤋
y = 2x + 3
3x + y = -17
3x + (2x + 3) = -17
3x + 2x + 3 = -17
5x + 3 = -17
5x = -20
x = -4
y = 2x + 3
y = 2(-4) + 3
y = -8 + 3
y = -5
x = -4
y = -5
2006-07-23 23:01:54 · answer #8 · answered by Sherman81 6 · 0⤊ 0⤋
systems of equations
y = -5
x = -4
2006-07-23 19:36:17 · answer #9 · answered by dabombshop 1 · 0⤊ 0⤋
uhhhh i dunno!
x= -4 ,y= -5 ??
lol, i think i learned this last year.
2006-07-23 19:36:47 · answer #10 · answered by rachie 1 · 0⤊ 0⤋