Question

determine o valor de X nos seguintes feixes de paralelas(a//b//c)

Answer 1

a) 

$\frac{x+4}{4} = \frac{12}{3} \\\\ 3x + 12 = 48 \\\\ 3x = 36 \\\\ x = 12$


b)  

$\frac{6}{8} = \frac{x}{7-x} \\\\ 42 - 6x = 8x \\\\ 8x = 42 - 6x \\\\ 14x = 42 \\\\ x = \frac{42}{14} \\\\ x = 3$


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