Thats just solving for y. Since slope-intercept form is y = mx + b.
x + 5y = 20
=> 5y = -x + 20
=> y = -x/5 + 4
3x - 7y = 42
=> 7y = 3x - 42
=> y = 3/7x - 6
2007-03-22 17:52:31
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answer #1
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answered by Kraca 3
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Slope-intercept form: y=mx+b, where m is the slope and b is the y intercept
x+5y=20
x+5y-x=20-x
5y/5= -x/5+20/5
y= (-1/5)x+4
The slope= -1/5, the y-intercept= 4
3x-7y=42
3x-7y-3x= -3x+42
-7y/-7= -3x/-7 + 42/-7
y= (3/7)x - 6
The slope= 3/7, the y-intercept= -6
2007-03-22 18:12:33
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answer #2
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answered by ellen z 1
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1) y = (20 - x)/5
y = -x/5 + 4
Slope: -1/5. Intercept: 4
2)
y = (3x - 42)/7
y = 3x/7 - 6
Slope: 3/7
Intercept: -6
2007-03-22 17:53:34
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answer #3
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answered by Rafael Mateo 4
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x + 5y = 20
5y = 20 - x
y = 4 - x/5
y = -1/5 x + 4
3x - 7y = 42
-7y = 42 - 3x
y = 42/-7 - 3x/-7
y = -6 + 3/7 x
y = 3/7 x - 6
2007-03-22 17:57:57
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answer #4
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answered by rooster1981 4
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Instead of telling you the answer, these people should be helping you learn what slope-intercept means.
Slope intercept equations have the form y=mx +b, where m is the slope of a line. The first thing you should do is get the y-variable on the opposite side of the equation from the x-variable.
ax+by = c turns into:
-ax+ax+by = c-ax
0+by = c-ax
Then you divide by the coefficient, in this case b.
by/b = (c-ax)/b
y = c/b-(a/b)x
2007-03-22 17:56:50
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answer #5
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answered by existenz48162 3
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5y = 20 - x
y = (20 - x)/5
y = -(x/5) + 4
-7y = 42 - 3x
y = (42 - 3x)/-7
y = -6 + 3/7x
y = (3/7x) - 6
good ol' algebra lol
2007-03-22 17:55:18
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answer #6
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answered by Anonymous
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slope intercept forms are forms which have y on one side and the rest equation on the otherside.
So the first one will be:
y= -1/5 x + 4
second one:
y= 3/7x - 6
2007-03-22 17:52:39
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answer #7
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answered by Anonymous
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y = 4 - 1/5x
y = 3/7x - 6
2007-03-22 17:51:16
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answer #8
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answered by Jimmy Dean 4
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y=(-x+20)/5
y=(3x-42)/7
2007-03-22 17:53:03
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answer #9
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answered by djin 2
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y= -1/5x +4
y= 3/7x - 6
2007-03-22 17:51:12
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answer #10
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answered by jacobm_24 2
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