In one purchase, 12 pounds of cotton yarn and 7 pounds of wool yarn were purchased for $259.45. In another purchase at the same prices, 18 pounds
of cotton yarn and 9 pounds of wool yarn were purchased for $362.25.
What is the cost per pound for the wool yarn?

Match the following reasons with the statements given to create the proof. 1. do = ob, ao = oc sas 2. doc = aob given 3. triangle cod congruent to triangle aob vertical angles are equal. 4. 1 = 2, ab = dc if two sides = and ||, then a parallelogram. 5. ab||dc if alternate interior angles =, then lines parallel. 6. abcd is a parallelogram cpcte