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Hi Savita,
Yes, that is a problem, and practice is part of the solution.
At the beginning you were strongly advised to make notes as you go along. This helps in understanding and gives you a permanent record to which you can refer, as well as helping when doing the quizzes. You can still do that as the videos are available for at least a couple of weeks yet.
Hi Savita,
y=mx+c is a standard form for straight lines. That is because by substituting specific values for m and c the equation always plots out to a straight, and all lines are inlcuded.
The nice thing about y=mx+c is that it turns out that m is the gradient (slope) of the line, and c is the intercept on the y-axis.Another standard form for a straight line is ax+by=c, so y=mx+c is not the only one.
Hi Savita,
Sri Bharati Krishna’s book does not mention this topic.
Mathematics is a vast subject and the book cannot cover everything. James Glover’s discovery directly relates to the Vedic Sutras and is simple and easy to understand. Hence we can include it as Vedic Maths.
Hi Savita,
There is only one line and one equation.
2x+5y=14 is exactly equivalent to -2x-5y=-14 mathematically.
One equation – one line.
That’s right Preeti. It’s brilliant the way that the Duplex automatically collects up similar terms.
Hi Savita,
It’s good you are exploring like this. It is like in ordinary life, we are prepared to make the adjustments we need to make the problem easy or manageable.
Anupama’s method for this particular division is probably as good as it gets. But for the divison by 118 you could use 12 as divisor witj (2) on the flag.
Or, you could halve both 847 and 236 (saves the halving at the end).
Or you could double 236 and work with a divisor of 5.The reverse multiplication method will work too.
Thanks Anupama, this is impressive.
These special methods give us a huge range of possibilities, and inspire creativity in the classroom.
Hi Mallika,
c is good. You get take a triple from 180 degrees most easily by just changing the sign of the first element.
Actually I forgot that triple subtraction comes up later in the book (in VMTTC we come to it in lesson 34), so my advice was not the best. I should have said to drop a perpendicular from M onto AB, call that point P. Then angle PMA is clearly 5,4,- and the required angle is double that.For d I’m not sure of your method, though your answer is right.
My advice would be to draw DB, then you can take 4,2,- from 1,1,- (the triple for 45 degrees), and then double.
