5x -2y =- 5, y -5x =3?
回答 (8)
2006-05-08 12:11 pm
✔ 最佳答案
ANSWER: y = 2; x = -1/5SOLUTION:
1) First solve for y. You can do this by adding the two equations together:
5x - 2y = -5
y - 5x = 3
Notice that you have a positive 5x on the first equation, and a minus 5x on the second equation, so they both cancel out and you can re-write the equation as follows:
- 2y = -5
y = 3
Add up these 2 equations and you get:
- 1y = -2 or y = 2
2) Then solve for x by replacing y with 2. You can use any of the 2 equations from the problem.
5x - 2(2) = -5
5x - 4 = -5
5x = -5 + 4
5x = -1
x = -1/5
2006-05-09 4:27 am
5x-2y=-5
-5x+y=3
y=-2
-5x+(-2)=3
-5x=3+2
-5x=5
x=-1
y=-2
x=-1
-5x+y=3
y=-2
-5x+(-2)=3
-5x=3+2
-5x=5
x=-1
y=-2
x=-1
2006-05-09 12:54 am
equation1 given is 5x - 2y = -5
equation2 given is y - 5x = 3
adding both the equation
5x - 2y + y - 5x = -5 + 3
-y = -2
Thus y = 2
putting the y value in equation1
5x - 2(2) = -5
5x - 4 = - 5
5x = -5 + 4
x = -1/5
equation2 given is y - 5x = 3
adding both the equation
5x - 2y + y - 5x = -5 + 3
-y = -2
Thus y = 2
putting the y value in equation1
5x - 2(2) = -5
5x - 4 = - 5
5x = -5 + 4
x = -1/5
2006-05-08 7:12 pm
y=2
x=-1/5
x=-1/5
2006-05-08 7:11 pm
(a)5x-2y=-5
(b)y-5x=3
From (b) y=3+5x, sub in (a)
5x-2(3+5x)=-5
5x-6-10x=-5
-5x=1
x=-1/5
Put x into (a)
5x-2y=-5
5(-1/5)-2y=-5
-1-2y=-5
-2y=-4
y=2
(b)y-5x=3
From (b) y=3+5x, sub in (a)
5x-2(3+5x)=-5
5x-6-10x=-5
-5x=1
x=-1/5
Put x into (a)
5x-2y=-5
5(-1/5)-2y=-5
-1-2y=-5
-2y=-4
y=2
2006-05-08 7:08 pm
God, do you ask people to do your homework?
2006-05-08 7:07 pm
5x-2y=-5
5x=-5+2y
x=-5+2y/5
y-(-5+2y/5)=3
y+5-2y/5=3
y-2y=3
-y=3
y=-3
5x=-5+2y
x=-5+2y/5
y-(-5+2y/5)=3
y+5-2y/5=3
y-2y=3
-y=3
y=-3
參考: infinite wisdom
2006-05-08 7:05 pm
x = -1/5
y = 2
y = 2
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