A - 3b = 4 . . . . (1)
a = b - 2 . . . . . (2)
Putting (2) into (1), we have
b - 2 - 3b = 4
-2b = 4 + 2 = 6
b = 6/-2 = -3
From (1), a = b - 2 = -3 - 2 = -5
Hence, solution = (-5, -3)
Depends on the shape of the region. Need more information.
If she starts with $8000, she has only $7000 to go.This is reduced by $850 per month.
$7000 - $850x
1) x= 2
6x2+10=22
2) x = 2
6x2-4=4x2