Posted by mi on Thursday, September 2, 2010 at 12:14pm.
tom was paid $4.50 per hour for painting a fence and $ 6.50 per hour for mowing grass. He worked 7 hours and earned $39.50. How many hours did it take him to paint the fence/

math  George, Thursday, September 2, 2010 at 1:07pm
the best way to go about this question is trial and error. if he worked 7 hours and made 39.50, then if he works 3 hours painting the fence, and 4 hours mowing the grass then he makes 39.50.
i'm sure you can make equations for it but it's much quicker and easier to go about this question this way.

math  mi, Thursday, September 2, 2010 at 1:21pm
my 6th grade grandaughter needs an equation. than you.

math  mi, Thursday, September 2, 2010 at 1:41pm
george can you give me some additional help. thanks

math  Jen, Thursday, September 2, 2010 at 1:53pm
x+y=7
4.5x+6.5y=39.5
Multiply the top equation by 4.5 to cancel the x's:
4.5x4.5y=31.5
4.5x+6.5y=39.5
2y=8
y=4
Put that back in the first equation to solve for x.

math  Jen, Thursday, September 2, 2010 at 1:54pm
You do NOT want to attempt this problem by trial and error.

math  George, Thursday, September 2, 2010 at 2:09pm
I feel i may have stepped on some toes. I am sorry for that. I am not the most intelligent person in the world and I sincerly appoligize.

math  Jen, Tuesday, September 7, 2010 at 10:17pm
No need for an apology, George. I was simply saying that it's not the best method. :)
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