(a) Explain with example the difference between scaling and normalization in solving system of linear equation (b) What does each of the following two equations represent graphically? What do we get when they intersect? w+x+y+z=4 w+2x3y+4z=9 (c) Find the value of (5/3+5+35)/3. Assume that you use three significant figures during calculation (Show both right and wrong interpretation of significant figures). (a) Derive the following formula for least square regression. {a1=nxi2(xi)2nxiyixiyia0=ya1x