Posted by angel on Tuesday, January 25, 2011 at 4:48pm.
3x+5y=0 2x5y=9
idk how 2 solve it then graph it my teacher eont help me plzz help

algebra  helper, Tuesday, January 25, 2011 at 5:02pm
I assume you need to solve these equations simultaneously ?
3x + 5y = 0
2x  5y = 9
Solving by elimination method. The object is to eliminate one of the variables, either x or y.
Since you have +5y in the first equation and 5y in the second equation, you ADD the two equations.
This is because +5y + 5y = 0.
3x + 5y = 0
2x  5y = 9
5x + 0 = 9
5x = 9
Divide both sides by 5
x = 9/5
To find y, substitute x = 9/5 in either equation and solve for y.
3x + 5y = 0
x = 9/5
3(9/5) + 5y = 0
27/5 + 5y = 0
Add 27/5 to both sides
27/5 + 27/5 + 5y = 27/5
5y = 27/5
Divide both sides by 5
y = 27/5 /5
Multiplying the numerator by the reciprocal of the denominator is the same as dividing.
y = 27/5 * 1/5
y = 27/25
I'll leave the check to you.
x = 9/5, y = 27/5

algebra  angel, Tuesday, January 25, 2011 at 5:04pm
o ok ty

algebra  helper, Tuesday, January 25, 2011 at 5:34pm
You're welcome.
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