The maple tree that is 20 inches tall is growing 4 inches per month, whereas the oak tree that is 26 inches tall is growing 3 inches per month.
4x + 20=3x + 26
-6x - 4y = -6; x=-5
y=9
Mr. Gilmore is contemplating which chauffeured car service to take to the airport. The first costs $10 up front and $2 per kilometer. The second costs $13 plus $1 per kilometer.
2x + 10 =1x + 13
-4x - y = 1; y=-5
x=1
Two road crews are paving a straight section of highway. The first crew has completed paving 81 miles and is completing 2 additional miles per day. The second crew has only finished 77 miles but is covering 3 miles per day.
2x + 81=3x + 77
3x - 6y = -9; y =3
x=3
2x + 5y = -7; x= -6
y=1
Solve for x: y=-x - 6; y=2x-3
x= -3
solve for y: 10x - 10y=3x +4
y=(10y+4)/7
6x + 6y = 6; x=7
y=-6
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