The slope of a line ST = −1. What is the value of y if S = (3,−2) and T = (−3,y). How would I solve this?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

What is r i 4.5+10r=-6.5 with work pls

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters