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Over [174]
3 years ago
13

I need help substituting number 4.

Mathematics
2 answers:
Aleksandr [31]3 years ago
7 0
       Solve, for the first variable in one of the equation, the substitute the final result into the other equation 
 
 
- \frac{17}{3}  ;  - -\frac{211}{21} 
Butoxors [25]3 years ago
3 0

I solved for x first by substituting y into equation # 2. 

-4y - 30 = -6x    =   -4y = -6x+30   =   y = (6x-30)/4

25 = -7y + 8x    

 25 = -7(6x-30)/4 + 8x

25 = (-42x + 210)/4 + 8x

25 = -10.5x + 52.5 + 8x

-27.5 = -2.5x

x = 11

Now solve for y

-4y - 30 = -6x

-4y - 30 = -66

-4y = -36

y = 9

Plug both numbers into the equations above and your answer checks out.

-4(9) - 30 = -6(11)

-36 - 30 = -66 (True)

25 = -7y + 8x

25 = -7(9) + 8(11)

25 = -63 + 88 (True)


hope this helps unless I totally misunderstood what the question was (which happens)


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Step-by-step explanation:

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2 years ago
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3 years ago
What is the answer I’m not sure I’m right
trasher [3.6K]

Answer:

x=0

Step-by-step explanation:

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3 0
3 years ago
HELPPP....PLEASE...........
kogti [31]

Answer:

9 1/3, 12 1/2, 14 3/4

Step-by-step explanation:

I assume the formula you’re working with is A=b*h since nothing says otherwise...

((Patio 1))

So you have your area (147) and your base (15 3/4), now you need to plug them in, which should look like this:

147= 15 3/4*h

You need to isolate your h in order to get the missing number, so you should divide both sides by 15 3/4 OR 63/4 ((15*3—>60+3=63))

Dividing by a fraction is the equivalent of multiplying by its reciprocal... so

147 * 4/63 = 588/63 which can be simplified to 84/9 once both the numerator and denominator are divided by 7

In mixed number for it is 9 3/9 which simplified becomes 9 1/3

You solve the other similarly

3 0
3 years ago
danny is installing a fence around his rectangular yard. His yard is 20feet by 45feet. If the fence cost 25 per foot based on th
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Answer:

$225

Step-by-step explanation:

The area to be fenced in is 20 ft by 45 ft, or 900 ft^2.  But "25 per foot based on the area" is illogical.  Please ensure that you have copied this problem down accurately, and be sure to provide units of measurement:  did you mean $25 per square foot, or per foot, or what?

The fencing cost is usually dependent on the unit cost and the length of the yard perimeter.  The perimeter is P = 2L + 2W, which here is P = 2(45 ft) + 2(20 ft), or 130 ft.  If the fencing is 25 cents per foot, $130 ft of fencing would come to $32.50.

               

6 0
2 years ago
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