Homework Help: algebra

Posted by angel on Monday, January 31, 2011 at 4:48pm.

i have 2 solve by elimination an i keep gettin fractions when the answer is (-3,-3)
my teacher gave me the answer an problem but she wants me 2 work it out
idk how i keep gettin fractions
the problem is:
-3x-4y=21
8x-5y=-9

please help

algebra - helper, Monday, January 31, 2011 at 5:03pm
Multiply by -5 (-3x - 4y = 21)
Multiply by 4 (8x - 5y = -9)

15x + 20y = -105
32x - 20y = -36
47x + 0 = -141
47x = -141
x = -3

8x - 5y = -9
x = -3
8(-3) - 5y = -9
-24 - 5y = -9
-5y = 15
y = -3
algebra - angel, Monday, January 31, 2011 at 5:11pm
ty

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