Help pls. it’s from khan academy

Find parametric equations for the line tangent to the curve of intersection of the surfaces at the given point. surfaces: xsquared2plus+2yplus+2zequals=1212 yequals=33 point: left parenthesis 1 comma 3 comma five halves right parenthesis

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Which spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1