Which is the solution to this system of equations?
x - 2y= 15
2x + 4y = -18

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

Thee blue triangle has rotated from quadrant i to quadrant iii about the origin. describe the effects of the rotation on the coordinates of the blue triangle.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?