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adell [148]
3 years ago
7

sorry the picture is blurry. I don't understand subsitution and need help. please help me I'm failing math and this will hopeful

ly get my grade up

Mathematics
2 answers:
BabaBlast [244]3 years ago
7 0
Assuming you want us to answer question 12.
11x - 7y = -14 
x - 2y = -4 

From the second equation, you can find x by adding 2y to both sides.
x = 2y - 4

Now that you've found what x is, go back to the first equation 11x - 7y = - 14
But now, wherever you see x in this, substitute in what you found for x. 
Our value for x is 2y - 4. 
11(2y - 4) - 7y = -14
Expand and simplify
22y - 44 - 7y = -14
15y - 44 = -14
15y = 30
y = 30/15 = 2

Now we know what y is, lets find x as a number.
Use what we found as x to find it as a number (x = 2y - 4), but substituting in 2 wherever we see 'y'.
So x = 2(2) - 4
= 4 - 4 = 0

So x = 0 and y = 2
Lady bird [3.3K]3 years ago
6 0
Okay so what you need to do is find the value of x or y. Substitute x or y for 0. After you do that, you'll be left with x on one side and y on the other. That's perfect. If x is alone, you want to substitute that into the equation, In parentheses. Then when you solve for the other term, you'll actually get a number answer. Then put that into the equation and substitute it where it should go, then solve and you'll get the second number
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The hardcover version of a book weighs 7 ounces while its paperback version weighs 5 ounces. Forty-five copies of the book weigh
konstantin123 [22]

Answer:

33 copies were paperback and 12 were hardcover.

Step-by-step explanation:

Let h represent the number of hardcover copies and p represent the number of paperback copies.

We know that the total number of copies was 45; this gives us the equation

h+p = 45

We know that each hardcover copy is 7 ounces; this gives us the expression 7h.

We also know that each paperback copy is 5 ounces; this gives us the expression 5p.

We know that the total weight was 249 ounces; this gives us the equation

7h+5p = 249

Together we have the system

\left \{ {{h+p=45} \atop {7h+5p=249}} \right.

We will use elimination to solve this.  First we will make the coefficients of the variable p the same; to do this, we will multiply the top equation by 5:

\left \{ {{5(h+p=45)} \atop {7h+5p=249}} \right. \\\\\left \{ {{5h+5p=225} \atop {7h+5p=249}} \right.

To eliminate p, we will subtract the equations:

\left \{ {{5h+5p=225} \atop {-(7h+5p=249)}} \right. \\\\-2h=-24

Divide both sides by -2:

-2h/-2 = -24/-2

h = 12

There were 12 hardcover copies sold.

Substitute this into our first equation:

12+p=45

Subtract 12 from each side:

12+p-12 = 45-12

p = 33

There were 33 paperback copies sold.

3 0
3 years ago
Read 2 more answers
Find the area of the shaded region. Round your answer to the nearest tenth.
spayn [35]

You need to include the Image

3 0
3 years ago
If synthetic division reveals a zero, why should we try that value again as a possible solution?
9966 [12]
Polynomials can have double roots, in fact they're pretty common. if you get a reasonable zero it costs very little time to try it again for a double root. answer is the second choice
6 0
3 years ago
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Find the value of x so that line m is parallel to line l.
MatroZZZ [7]
<h3>Answer:  A) 46</h3>

Explanation:

The angles shown are same side interior angles.

For line L to be parallel to line M, the same side interior angles must be supplementary, or they must add to 180.

28+(3x+14) = 180

28+3x+14 = 180

3x+42 = 180

3x = 180-42

3x = 138

x = 138/3

x = 46

4 0
3 years ago
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Round 2826 to the nearest hundred.
sergij07 [2.7K]

Answer:

2800

Step-by-step explanation:

2826 to the nearest hundred is 2800

3 0
3 years ago
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