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3 years ago

Which choice is the most efficient first step to solve this set of equations?

Mathematics

2 answers:

Minchanka [31]3 years ago

7 0

Answer:

the answer is B

Step-by-step explanation:

since one equation is already simplified then you shall plug in the other equation into the other to substitute and simplify

pogonyaev3 years ago

6 0

Answer:

3x+4(2x+4) = 17

Substitute (2x+4) for y in the second equation

Step-by-step explanation:

Given the simultaneous equation;

y = 2x+4...(1)

3x+4y = 17...(2)

The most efficient first step to take is substituting equation 1 which is y = 2x+4 into equation 2 as shown.

3x+4(2x+4) = 17

This will reduce the two unknown in an equation to just one making it easier to find the single variable.

It will reduce the equation to:

3x+8x+16 = 17

11x+16 = 17.

Hence, this option below is correct

3x+4(2x+4) = 17

Substitute (2x+4) for y in the second equation.

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Chelsea's school is selling tickets to a choral performance. On the first day of ticket sales the school sold 3 adult tickets an

seropon [69]

Answer:

$7 for an adult ticket

$6 for a child ticket

Step-by-step explanation:

Add up the total child and adult tickets from both the days.

Adult tickets - 15

Child tickets- 10

Then I divided 165 but 25 and got 6.6.

The child ticket should be less than the adult so I guessed that the adult would be around $7 and the child ticket would be around 6.

I double checked my work by doing...

3*7 giving me 21

and

9*6 giving me 54.

Then I added these up to get $75 which was the total from the first day. This shows that our answer is correct

8 0

3 years ago

Solve. - 1/5 y = 10 A) -100 B) -50 C) 50 D) 100

Black_prince [1.1K]

The answer would be B

6 0

3 years ago

Y=-3/8x-7 in standard form

Readme [11.4K]

Y = -3/8x - 7....add 3/8x from both sides
3/8x + y = -7 ...multiply both sides by 8
3x + 8y = - 56 <==

6 0

3 years ago

What is the perimeter of a polygon with vertices at (−2, 1) , (−2, 4) , (2, 7) , (6, 4) , and (6, 1)

Marina CMI [18]

Check the picture below.

now, the sides at the bottom, the straight sides, are plain to see how long each is, you can pretty much count the units off the grid.

so, the only ones you need the distance formula or pythagorean theorem is the slanted ones, there are two, and both are equal, so, just get the length of one, and double it up.

$\bf \textit{distance between 2 points}\\ \quad \\
\begin{array}{lllll}
&x_1&y_1&x_2&y_2\\
% (a,b)
&({{ 2}}\quad ,&{{ 7}})\quad 
% (c,d)
&({{ 6}}\quad ,&{{ 4}})
\end{array}\qquad 
% distance value
d = \sqrt{({{ x_2}}-{{ x_1}})^2 + ({{ y_2}}-{{ y_1}})^2}
\\\\\\
d=\sqrt{(6-2)^2+(4-7)^2}\implies d=\sqrt{4^2+(-3)^2}\implies d=\sqrt{16+9}
\\\\\\
d=\sqrt{25}\implies d=5$

double that up, and both slanted sides are 10, the perimeter is all sides summed up.

5 0

3 years ago

I really need your help

scZoUnD [109]

Answer:

It is False

Step-by-step explanation:

the left side does not equal to the right side

4 0

3 years ago