Pls help explain how to do this i have to do like 20 more of there pls

Solve the system of equations y= 3/2 - 1, -x+ y =-3

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 4x^2 - 19x- 5

Mon wants to make 5 lbs of the sugar syrup. how much water and how much sugar does he need… …to make 5% syrup?