Can someone me with this question.

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

Mexico city, mexico, is the world's second largest metropolis and is also one of its fastest-growing cities with a projected growth rate of 3.2% per year. its population in 1991 was 20,899,000 people. use the formula p = 20.899e0.032t to predict its population p in millions with t equal to the number of years after 1991. what is the predicted population to the nearest thousand of mexico city for the year 2010?