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biology paper 61 and math paper 22 doubts!

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What is hydrogen carbonate indicator for?
for example, you have a plant that was placed in the dark and respired, it will take oxygen and give out carbon dioxide gas and CO2 is acdic gas the indicator hydrogen carbonate will be change into a certain color when there's an acidic gas
 
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you subsitute the point (0,10) onto the line equation which is y=mx+b
when you do that you'll get the intercept which is 10
im still trying to figure out how to get the gradient
I also reached tll here bt struggling wth next part
 
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