# integration alevel. y1-y2 DX which graph is y1 and y2?

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#1
what graph it y1 and y2? like does it make a difference? or and how do you pick which graph is y1 and y2
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1 month ago
#2
Can you post the actual question behind this?

Integrating y1-y2 will be the negative of integrating (y2-y1) as you might have guessed.
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#3
(Original post by mqb2766)
Can you post the actual question behind this?

Integrating y1-y2 will be the negative of integrating (y2-y1) as you might have guessed.
the general method to finding the area under the curve
is y1-y2 Dx but i don't know which equation to label what
he says it here method 1
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1 month ago
#4
(Original post by interlanken-fall)
the general method to finding the area under the curve
is y1-y2 Dx but i don't know which equation to label what
he says it here method 1
In simple terms, you want to make the choice that means y1-y2 is always positive (over the region in which you're integrating).
0
1 month ago
#5
Take Y1 to be the upper curve of the region and Y2 the lower curve. In the video the parabola is above the line in the region, so Y1=quadratic curve and Y2=line.
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#6
(Original post by vc94)
Take Y1 to be the upper curve of the region and Y2 the lower curve. In the video the parabola is above the line in the region, so Y1=quadratic curve and Y2=line
what if it isnt a line but 2 curves
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1 month ago
#7
(Original post by interlanken-fall)
what if it isnt a line but 2 curves
You're really doing
Int y1 - Int y2
You're subtracting one area from another. There is no assumption that y2 is a line.
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#8
(Original post by mqb2766)
You're really doing
Int y1 - Int y2
You're subtracting one area from another. There is no assumption that y2 is a line.
omg you are incredible, ive been overthinking this and acting like y1-y2 is some huge formulae and I need to find which equation is what y value,
it just means 1 area - 2nd area = area thank you
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