o valor do taxímetro obedece a uma função afim y=7,5x+2,5 onde (x) é a distância percorrida (a) Qual valor cobrado ao percorre 85km?
B A distância que foi paga ao taxista r$ 72,50 ?
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Solução!
![f(x)=7,5x+2,5\\\\\\
x=85km\\\\\\\
f(85)=7,5(85)+2,5\\\\\\
f(85)=637,5+2,5\\\\\\
\boxed{f(85)=640}](https://tex.z-dn.net/?f=f%28x%29%3D7%2C5x%2B2%2C5%5C%5C%5C%5C%5C%5C%0Ax%3D85km%5C%5C%5C%5C%5C%5C%5C%0Af%2885%29%3D7%2C5%2885%29%2B2%2C5%5C%5C%5C%5C%5C%5C%0Af%2885%29%3D637%2C5%2B2%2C5%5C%5C%5C%5C%5C%5C%0A%5Cboxed%7Bf%2885%29%3D640%7D "f(x)=7,5x+2,5\\\\\\
x=85km\\\\\\\
f(85)=7,5(85)+2,5\\\\\\
f(85)=637,5+2,5\\\\\\
\boxed{f(85)=640}")
![B)\\\\\\
f(x)=7,5x+2,5\\\\\\
72,50=7,5x+2,5\\\\\\
72,50-2,5=7,5x\\\\\\
70=7,5x\\\\\
x= \dfrac{70}{7,5}\\\\\\
\boxed{x=9,3km}](https://tex.z-dn.net/?f=B%29%5C%5C%5C%5C%5C%5C%0Af%28x%29%3D7%2C5x%2B2%2C5%5C%5C%5C%5C%5C%5C%0A72%2C50%3D7%2C5x%2B2%2C5%5C%5C%5C%5C%5C%5C%0A72%2C50-2%2C5%3D7%2C5x%5C%5C%5C%5C%5C%5C%0A70%3D7%2C5x%5C%5C%5C%5C%5C%0Ax%3D+%5Cdfrac%7B70%7D%7B7%2C5%7D%5C%5C%5C%5C%5C%5C%0A%5Cboxed%7Bx%3D9%2C3km%7D+ "B)\\\\\\
f(x)=7,5x+2,5\\\\\\
72,50=7,5x+2,5\\\\\\
72,50-2,5=7,5x\\\\\\
70=7,5x\\\\\
x= \dfrac{70}{7,5}\\\\\\
\boxed{x=9,3km}")
Bom dia!
Bons estudos!
Solução!
Bom dia!
Bons estudos!
Ryansantos01928:
vlw
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