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The answer is Q.
Suppose you have the points with coordinates (p, q) and (r, s) then, provided p is different from r, the slope of the line is (q - s)/(p - r) = m, say. Then, if (x, y) is any point on the line, (x - s)/(y - r) = m That, after simplification, is the linear equation of the line. This will be a lot simpler when you have numerical values for p, q, r and s rather than work algebraically throughout. If p is not different from r, then the equation is x = p (or r), a vertical line.
9 P. in the S. S. equals 9 planets in the solar system EDIT: Which is no longer the case, as Pluto has now been classified as a dwarf planet.
Yes. If one matrix is p*q and another is r*s then they can be multiplied if and only if q = r and, in that case, the result is a p*s matrix.
Two ratios, p/q and r/s (q and s non-zero) are equal if p/q - r/s = 0.