Question 352149
*[invoke quadratic "x", 1, -2, -3 ]*[invoke linear_substitution "x", "y", 1, 1, 2, 1, -1, 0 ]*[invoke substitution "x^2-2x", "x", 3 ]*[invoke describe_linear_equation 4, 2, 8 ]*[invoke linear "x", "y", 1, 1, 2, 1, -1, 0 ]