Question 38010
Please only put ONE question in each submission!!!  I will answer your first question.

By algebra:
*[invoke linear_substitution "x", "y", -2, 3, 6, 3, 1, 2]

By graphing
*[invoke describe_linear_equation -2, 3, 6]
*[invoke describe_linear_equation 3, 1, 2]

Hope this helps and feel free to contact me with further questions,
lyra