Solve for the area of the triangle in each of the following problems.

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100

Which of the following points is collinear with (-2,1) and (0,3)

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10