Question

285p+15f=1275

270p+30f=1350 f represents the # of calories in gram of fat
and p represents the # of calories how many calories are in a gram of fat ?

Answer 1

please someone help me

Answer 2

solve the system of equations

Answer 3

ok im going 2 try

Answer 4

When I solved the system I got p=4 and f=9. I'm not sure how to apply that exactly. Does it mean that 9 fat grams is 4 calories...so 1 fat gram is 2.25 calories.

sorry...I can't be of any more help than that

Answer 5

thank you

Answer 6

doing a little more work, I've determined there are 9 calories in 1 gram of fat

Answer 7

thanks

Answer 8

zorry but i try to get p and f but i couldnt can you tell me how you got it

Answer 9

OK

Answer 10

285p+15f=1275 -2(285+15f=1275) -570p-30f=-2550
270p+30f=1350 270p+30f=1350
__________________

Answer 11

multiply the top equation by (-270/285)

then add the two equations, which will

eliminate the p terms and give you a simple equation for f.

Answer 12

sorry...hit wrong button...simplifying the part with the dotted line, I get
-300p=-1200 solve for p and you get 4

I multiplied by -2 above so I could solve the system of equations by elimination.

Since I know p, and can find f by substituting 4 into the given equations. When I did that, I got f=9.

Answer 13

What douglas...said is also a way to solve. I didn't want to work with fractions, so i decided to eliminate the other variable.

Answer 14

thank you that help me alot thanks both of you