alinakayy
alinakayy
03-01-2017
Mathematics
contestada
Can someone please help with this question
Respuesta :
AL2006
AL2006
03-01-2017
How nice of them to GIVE us the system of equations !
This thing has already almost solved itself.
3j + 5p = 7.60
j + 2p = 2.90
Write both equations again, but this time,
multiply each side of the second one by 3 :
3j + 5p = 7.60
3j + 6p = 8.70
Now subtract the top equation from the bottom one:
0 + p = 1.10
and Bada-Bing ... There's the cost of the pancake special ... p = $1.10 .
We can take the second original equation now:
j + 2p = 2.90
Subtract one ' p ' from each side:
j + (2p - 1p) = (2.90 - 1.10)
j + p = $1.80
There's your bill for one juice and one pancake special.
Notice that the juice is only 70 cents.
They didn't ask us for that.
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