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zysi [14]
2 years ago
7

when solving the following system of equations by substitution what would be a correct first step x=y–7 3x+15y=-1

Mathematics
1 answer:
seraphim [82]2 years ago
7 0

Answer:

The first step is to replace the value of x from the first equation with x in the second equation:

x=y-7

3x+15y=-1

3(y-7)+15y=-1        

3y-21+15y=-1

18y=-1+21

18y=20

y= \frac{20}{18} = \frac{10}{9}

x= \frac{10}{9} - 7

x=- \frac{53}{9}

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Luda [366]
<u>Sampe : Total</u>
25        :   750
(÷25)       (÷25)
  1         :    30
( x7)         ( x7)
  7        :    210

Answer:  (a) There is a total of 210 orange cakes made on Monday.

The sample is 5 when corrected to the nearest whole number.
⇒Smallest possible number is 4.5

Total orange cakes baked on Tuesday = 4.5 x 30 = 135

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Answer: (b) The probability is 9/50

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2 years ago
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The value of polynomial 5x-4x^2+3, when x=-1<br>​
Alchen [17]

Answer:

-6

Step-by-step explanation:

\text{Given that,}\\\\5x-4x^2 +3 \\\\\text{When}~ x = -1,\\\\~~~5(-1) -4(-1)^2 +3 \\\\=-5-4(1)+3\\\\=-5-4+3\\\\=-5-1\\\\=-6

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2 years ago
Can someone help me answer this please
Citrus2011 [14]

Answer:

N = 3/8

Step-by-step explanation:

let the number be N

let's express the word sentence as a mathematical expression:

"a number multiplied by 2/5"

= "N" multiplied by 2/5

= N x (2/5)

= (2N/5) ------- (1)

"a number multiplied by 2/5 is 3/20" can be written as:

(2N/5)    =  3/20  (multiplying both sides by 5)

2N = (3/20) x 5

2N = 3/4      (divide both sides by 2)

N = (3/4) ÷ 2

N = (3/4) x (1/2)

N = 3/8

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2 years ago
What are the answers?
algol13

Answer:

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Step-by-step explanation:

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