Use the linear combination method to solve the system of equations.
–2.1x + 4y = 5.3 2.1x – 5.5y = –0.2
what is the solution to the system?

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%.

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?