Can someone me with my homework with these two questions !

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

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?

28 x 12 + 34 = ? it's for a test that if i fail on i will not proceed into the honor roll society i always dreamed of!me! worth 50 !