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okay so A is a 2x2 matrix.for it to be singular its determinate has to equal 0.a 2x2 matrix's determinate is equal to m_1,1m_2,2 - m_1,2m_2,1for this example:det(A)...

Since we are told that the line l is perpendicular to the line PQ, we first need to find out the gradient of PQ.
To do this, it is easiest to find out the co-ordinates of points P and Q in terms of...

Start by looking at the form of equation where we can use the integrating factor:y' + f'(x)y = g(x) The general principle of this method is that by multiplying our expression by some function of x it ...