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Andrei [34K]
3 years ago
10

What is the solution to this equation?

Mathematics
1 answer:
Anettt [7]3 years ago
6 0

Answer:

B. a = 5

Step-by-step explanation:

3(a - 4) + 1 = 9 - a

Distribute the 3 into the parenthesis.

3a - 12 + 1 = 9 - a

Add -12 and 1.

3a - 11 = 9 - a

Add a to both sides.

4a - 11 = 9

Add 11 to both sides.

4a = 20

Divide both sides by 4.

a = 5.

Proof:

3(a - 4) + 1 = 9 - a

Substitute variable.

3(5 - 4) + 1 = 9 - 5

Subtract inside parenthesis.

3(1) + 1 = 9 - 5

Multiply 3 and 1.

3 + 1 = 9 - 5

Add 3 and 1.

4 = 9 - 5

Subtract 5 from 9.

4 = 4.

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3 years ago
13. Find the measure of an angle if its measure is eight less than six times its complement.
tatiyna
For an instance, the measure of the angle is represented by y, and the measure of its complement is represented by x. We should write the expression for the problem.
⇒ We can express "eight less" as -8
⇒ We can express "six times its complement" as 6x
The first equation will be
y = 6x - 8

In the second equation, we will describe about the complementary angles. If they add up, the result is 90°. The second equation will be
x + y = 90

Using substitution method, we will find the value of x
x + y = 90
x + 6x - 8 = 90
7x - 8 = 90
7x = 90 - 8
7x = 82
  x = 82/7

Using substitution method, we find the value of y
y = 6x - 8
y = 6(82/7) - 8
y = 492/7 - 8
y = \frac{492}{7}- \frac{56}{7}
y = \frac{436}{7}
y = 62.3
to the near whole number
y = 62

The measurement of the angle is 62°
5 0
4 years ago
What is 30 + 12 = e - 42
IrinaVladis [17]

Answer:

e = 84

Step-by-step explanation:

30 + 12 = e - 42

e = 42 +42

e = 84

6 0
2 years ago
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