Which of these graphs represents a proportional relationship?

please help me

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

What is the volume of a rectangular prism that is 120 centimeters by 2 meters by 1.5 meters in cubic meters?

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap