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zmey [24]
3 years ago
14

Which is a simplified form of the expression 3a + 7 – a – 7?

Mathematics
2 answers:
zheka24 [161]3 years ago
7 0

Answer:

A) 2a

Step-by-step explanation:

3a+7-a-7

3a-a+7-7

2a+7-7

2a

lord [1]3 years ago
3 0

Answer:

Choice A.

Step-by-step explanation:

3a + 7 - a - 7 = 3a+7 - a+7 = 3a-a = 2a

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Read 2 more answers
Solve for x &amp; y solve x = 3 + yy = -2x + 9
sergey [27]

x = 3 + y Eqn(1)

y = -2x + 9​ Eqn(2)

Let us solve the system of equations with the substitution method

x - 3 = y (Subtracting 3 from both sides of the Eqn(1))

Replacing y = x - 3 in Eqn (2), we have:

x - 3 = -2x + 9

x = -2x + 9 + 3 (Adding 3 to both sides of the equation)

x + 2x = 9 + 3 (Adding 2x to both sides of the equation)

3x = 12 ( Adding like terms)

x = 12/3 (Dividing by 3 on both sides of the equation)

x = 4

Replacing x=4 in Eqn(1), we have:

4 = 3 + y

4 - 3 = y (Subtracting 3 from both sides of the equation)

y=1

The answers are:

x= 4 and y=1

6 0
2 years ago
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