4 - 2x = x + 315 - 2(y - 1) = y + 4(-2 + 3y)7a - (2a - 1) = 4 + (a

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4 - 2x = x + 31

5 - 2(y - 1) = y + 4(-2 + 3y)

7a - (2a - 1) = 4 + (a - 6)

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Incógnitas de um lado, números do outro. Lembrando que, ao mudar de lado, a operação muda.

$4 - 2x = x + 31
\\\\
-2x - x = 31-4
\\\\
-3x = 27
\\\\
-x = \frac{27}{3}
\\\\
-x = 9 \ \ \times (-1)
\\\\
\boxed{\boxed{x = -9}}$

$5 - 2 \cdot (y - 1) = y + 4 \cdot (-2 + 3y)
\\\\
5-2y+2 = y -8 + 12y
\\\\
-2y - y - 12y = -8 - 5 - 2
\\\\
-15y = -15
\\\\
y = \frac{-15}{-15}
\\\\
\boxed{\boxed{y = 1}}$

$7a - (2a - 1) = 4 + (a - 6)
\\\\
7a - 2a + 1 = 4 + a - 6
\\\\
7a-2a-a = 4-6-1
\\\\
4a = -3
\\\\
\boxed{\boxed{a = -\frac{3}{4}}}$

2 votes Thanks 2

MATHSPHIS

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a)
4 - 2x = x + 31
-2x - x = 31 - 4
-3x = 27
x= -9

b)
5 - 2(y - 1) = y + 4(-2 + 3y)
5 -2y + 2 = y - 8 +12y
-2y - y -12y = -8 - 5 - 2
-15y = -15
y = 1

c)
7a - (2a - 1) = 4 + (a - 6)
7a - 2a +1 = 4 + a - 6
7a - 2a - a = 4 - 6 - 1
4a = -3
a=-3/4

1 votes Thanks 1

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