In previous problems, linear interpolations, your solutions were based on an expression (1) (1) y=y0+x1x0y1y0(xx0) In bilinear interpolation, the solution is found by applying the expression (2) (2) y=x1x0y0(x1x)+y1(xx0)=x1x0y0(x1x)+x1x0y1(xx0) Justify expression (2) with algebraic rules -by multiplication of expression (1)