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Question 185395: 3x+7y=21
3x-3x+7y=3x+21
7y/7=3x+21
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7
3x/7+21/7
3x/7+3
Answer by nerdybill(7384)   (Show Source):
You can put this solution on YOUR website! 3x+7y=21
.
Subtracting 3x from both sides:
3x+7y-3x = -3x+21
7y = -3x+21
.
Now, dividing both sides by 7:
y = (-3/7)x + 3 (this is what they're looking for)
.
This is now in "slope-intercept" form:
y = mx + b
where
m is slope
b is the y-intercept at (0,b)
.
So, from:
y = (-3/7)x + 3
m is -3/7
b the y-intercept is at (0, 3)
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