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Agata [3.3K]
2 years ago
13

Which properties justify the steps taken to solve the system 4x + 3y =25 2x + 5y=19 ​

Mathematics
1 answer:
defon2 years ago
7 0

Answer: we multiply the second equation by -2. This property is the multiplication property of equality (1).  

Then, we add the two equations generated. (2) addition property of inequality.

Next, we divide both sides of the equation by 13. That is division property of inequality.  

Moreover, we substitute the value obtained for y in the first equation. This is substitution property of equality.  

Then, we simplify

Next, we add +3 to both sides of the equation in order to have an equation with only one side having a variable. That is addition property of equality.  

Lastly, we divide both sides of the equation by 4. This is division property of equality.

Step-by-step explanation:

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madam [21]

Answer:

2x² +2x - 12

Step-by-step explanation:

area of rectangle = length X width

length = x+3

width = 2x - 4

Area = (x+3)(2x-4)

        = x(2x-4) +3(2x-4)

        = 2x² - 4x + 6x - 12

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3 years ago
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Answer:

2

Step-by-step explanation:

2 shows up the most amount of times and is the most frequent number. So the frequency of the data set is 2.

1 - |||

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8 0
2 years ago
Evaluate the expression for a = 5 and b = 12.
Evgesh-ka [11]
The answer is c
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5 0
3 years ago
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Using the net below, find the surface area of the triangular prism.
Sveta_85 [38]

160 i believe. to find the area of a triangle act like its a square and divide in half. for squares multiply base by height.

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8 0
2 years ago
Susie scored 85, 84,and 78 on three of the four math tests. if her average score for the four tests was 86. what was her score o
nata0808 [166]
(85 + 84 + 78 + x) / 4 = 86
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247 + x = 86 * 4
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x = 344 - 247
x = 97 <=== her score was 97
7 0
3 years ago
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