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yea m jst helpin some other ppl too :) i'll come back as soon as i get notification :)
mmk. what i have so far is this: 1.70f + 1.30s = $37.90 5.60f + 5.40 = 147.20 my teacher says this is correct, i just need to evaluate now, and im stuck @imqwerty
k im back
ok there is a typo that shuld be 5.40s
yeaa sorry i was in a rush but yea thats wat its supposed to say
1.70f + 1.30s = $37.90 1.7f=37.9-1.3s f=(37.9-1.3s)/1.7 substitute this value of f in the second equation and u'll get the value of s then put the value of s in any of these equations to get the value of f
did u get how we took out the value of f in terms of s ?
no do u know algebra nation?
whelp...we use the elimination method, elimination multiple, and the substitution method to solve this. we havent learned that way
ok lets do it that way
do u know how?
1.70f + 1.30s = $37.90 multiply this equation by 5.6/1.7 u get- (5.6/1.7)1.7f+(5.6/1.7)1.3s=(5.6/1.7)37.9 5.6f+(5.6/1.7)1.3s=(5.6/1.7)37.9 now subtract this equation from the second equation to eliminate 5.6f :) and then u'll be left with an equation with s.. can u solve it now?
imust seem really stupid, i know how to do this, just not for this problem sorry
don wrry :)
can u still help me?
so we have this- 5.6f+(5.6/1.7)1.3s=(5.6/1.7)37.9 equation1 and we got another equation-5.60f + 5.40s = 147.20 equation 2 subtracting equation 1 frm 2 u get- 5.60f + 5.40s - [5.6f+(5.6/1.7)1.3s] =147.20 -(5.6/1.7)37.9 5.60f + 5.40s - 5.6f - (5.6/1.7)1.3s = 147.20 -(5.6/1.7)37.9 5.4s-(5.6/1.7)1.3s =147.2 -(5.6/1.7)37.9 can u solve this equation to get s if ur stuck then don hesitate to ask :P :)
why are u dividing?
u mean that 5.6/1.7?
well we wanted to finish off the 5.6 f in the second equation by we had a 1.7f in the 1st equation so to make it 5.6f we multiplied the whole equation by 5.6/1.7 :)
i dont understand
watch this- https://www.khanacademy.org/math/algebra-basics/core-algebra-systems/core-algebra-systems-tutorial/v/solving-systems-of-equations-by-elimination
i dont hae time, i got a TON of hw
i guess ill just leave it blank, i have no idea what ur saying