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- Determine x, y and z using a) Cramer’s rule and b) substitution or elimination method, show COMPLETE SOLUTIONS.2. Solve for y only using Cramer’s rule if:x + y + 2z = 32x − 3y +z = 03x + 3y +z = 5.Find ∂z/∂t if z = sin(5x3-3y2), x = 2s2+t2, y = 2st3. Write in terms of the two independent variables, Do not simplify after that.