Given the matrix R = (3¹), i. show that R is non-singular. find R¹, the inverse of R. ii. iii. show that RR-¹ = I. Use the matrix method or otherwise to solve the following system of simultaneous equations: i. x+2y+3z=-5 ii. 3x+y-3z=4 111. - 3x + 4y +7z=-7

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