11y
(2y-11)^2
44y * 365.25d/y * 24h/d * 60m/h = 23142240(ydhm/ydh) = 23142240m
x + y = -7 x - y = 37x = -7-y-7-y-y = 37-7-2y = 37-2y = 44y = -22x - 22 = -7x = 15So -22 and 15
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x+y=110 .53x+.97y=.65*110 x=110-y .53(110-y)+.97y=.65*110 .53*110-.53y+.97y=.65*110 .97y-.53y=(.65-.53)*110 .44y=.12*110 y=.12*110/.44 = 30 ml x=110-30 = 80 ml So, you need 80 ml of the 53% solution and 30 ml of the 97% solution.