1, ya, ya) is the the cross product of two vectors i = (11, 12, 13) and y = vector: i x y = (i 2 y3 – 1392,- (i 143 – i3yı), i 192 – iayı) let k = (2,1,-1). show that the line ar mapping l: r r defined by: l(t) = i x r is a line ar mapping. find a 3 x 3 matrix a such that l = la steps: (a) use algebra to show that: (ci) = cl(t) for 1 = (i1, i2, i3) and c any real number. (b) use algebra to show that: lt +z) = l(1)+l(z) for i = (i1, i2, i3), z = (21,22,23).