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podryga [215]
2 years ago
6

The work of a student to solve a set of equations is shown: Equation A: y = 4 − 2z Equation B: 4y = 2 − 4z Step 1: −4(y) = −4(4

− 2z) [Equation A is multiplied by −4.] 4y = 2 − 4z [Equation B] Step 2: −4y = 4 − 2z [Equation A in Step 1 is simplified.] 4y = 2 − 4z [Equation B] Step 3: 0 = 6 − 6z [Equations in Step 2 are added.] Step 4: 6z = 6 Step 5: z = 1 In which step did the student first make an error? (5 points)​
Mathematics
2 answers:
mina [271]2 years ago
8 0

Answer:

step 2.

Step-by-step explanation:

dem82 [27]2 years ago
4 0

Answer:

The student made the first mistake in step 2.

Step-by-step explanation:

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If -4 - (-9) = x, what is the value of -3x?
GarryVolchara [31]

Answer:

-15

Step-by-step explanation:

First you want to make the -9 into positive because 2 negitives next to eachother equals a positve and them you add together to get 5=x. Lastly you times 5 by -3 to get -15

4 0
2 years ago
What is the value of the 9 3/4- 2 1/5 +1/2
vazorg [7]

Answer:

93 will the answer

Step-by-step explanation:

yes htey are good

5 0
2 years ago
What is the total price of a boat with an original price of ​12916$​, if it is sold at a ​15% ​discount? The sales tax rate is 3
Dmitriy789 [7]

Answer:

$11390.30

Step-by-step explanation:

Discount

12916 x 0.15 = 1937.4

Discounted price

12916 - 1937.4 = 10978.6

Tax of 3 and 3/4 percent which I think is 0.0375

10978.6 x 0.0375 = 411.6975

Total

10978.6 + 411.6975 = $11390.2975

7 0
2 years ago
Mark owns a personal training business. He makes a total of $500 for every 3 clients he acquires. How much money will 21 clients
IRISSAK [1]

Answer:

$3,500

Step-by-step explanation:

500:3

3x7=21

500x7=3,500

$3,500 for 21 cilents

8 0
3 years ago
Read 2 more answers
A textbook store sold a combined total of 392 physics and psychology textbooks in a week. The number of physics textbooks sold w
katen-ka-za [31]

Answer:

Psychology textbooks = 98 and physics textbooks = 294

Step-by-step explanation:

Let there are x psychology textbooks sold.

No of physics textbooks sold = 3x

ATQ,

A textbook store sold a combined total of 392 physics and psychology textbooks in a week.

x + 3x = 392

4x = 392

x = 98

It means there are 98 psychology textbooks sold and 3x = 3(98) = 294 physics textbooks sold.

5 0
2 years ago
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