3x+2y= -8
multiply by 3 to,x-y= -1
so u will get,
3x+2y= -8
-3x+3y=+3,eliminating both of them you will get,
5y= -5
y = -1
by applying the value of y,
3x+2*-1= -8
3x - 2= -8
3x= -5
x = -5/3
Example:
Joe walks 4 3/5 mile in 122 minutes. What is his unit rate? To obtain this, divide 4 3/5 by 122 minutes:
23
---
5 23 1 23 mi
----------- = ----- * -------------- = ------- ------- = 0.135 mile/min
122 min 5 122 min 170 min
----------
1 = 714.4 ft/min
Note how the unit rate involves "1 min" as part of the overall unit of measurement.
We can compare the two units or object performances by that.... even in the case of magnitude lower than zero....