7x6 use known facts to find product

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

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*