Question

equação de primeiro grau:
a)x+1=2
b)x+5=0
c)3+x=1
d)2x-6=12
e)x . 8=56
f)3x-9=x+6

mim ajudemmmm pfvvv
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Answer 1

a)

$x + 1 = 2 \: \rightarrow \: x = 2 -1 \rightarrow \: \boxed{\red{x = 1}}$

b)

$x + 5 = 0 \: \rightarrow \: x = 0 - 5 \: \rightarrow \: \boxed{\red{x = - 5}}$

c)

$3 + x = 1 \: \rightarrow \: x = 1 - 3 \: \rightarrow \: \boxed{\red{x = - 2}}$

d)

$2x - 6 = 12 \: \rightarrow \: 2x = 12 + 6 \: \rightarrow \: x = \frac{18}{2} \rightarrow \: \boxed{\red{x = 9}}$

e)

$x \times 8 = 56 \: \rightarrow \: x = \frac{56}{8} \: \rightarrow \: \boxed{\red{x = 7}}$

f)

$3x - 9 = x + 6 \: \rightarrow \: 3x - x - 9 = 6 \: \rightarrow \: 2x - 9 = 6 \: \rightarrow \: 2x = 6 + 9 \: \rightarrow \: x = \frac{15}{2} \: \rightarrow \: \boxed{\red{x = 7,5}}$