P4.7.6 - Vector equations of lines

Vector equations of lines.; To include the forms r = a + tb and r = c + t(d – c) Conditions for two lines to be parallel, intersecting or skew.

Use vector equations of lines to connect the rule to the data and decision in the question.

This matters because vector equations of lines determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply vector equations of lines to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: use the formula and units given in the question, show the substitution and interpret the result; the calculation alone is not the conclusion.