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trasher [3.6K]
3 years ago
9

Solve by using substitution x=3y-1 x+2y=9

Mathematics
1 answer:
kogti [31]3 years ago
3 0

Answer:

x=3y−1x=3y-1

x+2y=9x+2y=9

Replace all occurrences of xx with 3y−13y-1 in each equation.

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Replace all occurrences of xx in x+2y=9x+2y=9 with 3y−13y-1.

(3y−1)+2y=9(3y-1)+2y=9

x=3y−1x=3y-1

Add 3y3y and 2y2y.

5y−1=95y-1=9

x=3y−1x=3y-1

Solve for yy in the first equation.

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Move all terms not containing yy to the right side of the equation.

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Add 11 to both sides of the equation.

5y=9+15y=9+1

x=3y−1x=3y-1

Add 99 and 11.

5y=105y=10

x=3y−1x=3y-1

Divide each term by 55 and simplify.

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Divide each term in 5y=105y=10 by 55.

5y5=1055y5=105

x=3y−1x=3y-1

Cancel the common factor of 55.

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Cancel the common factor.

5y5=1055y5=105

x=3y−1x=3y-1

Divide yy by 11.

x=5,y=2

Step-by-step explanation:

please mark me as brainliest thank you

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What is 70=1/2((5x+10)-(3x-2))
Nina [5.8K]

Answer: x = 64

Step-by-step explanation:

70 = 1/2((5x+10)-(3x-2)

(remove the inner bracket)

70 = 1/2(5x+10-3x+2)

(transfer 1/2 to LHS)

70*2 = 2x + 12

140 = 2x+12

(transfer 12 to LHS)

140 - 12 = 2x

128 = 2x

(transfer 2 to LHS)

128/2 = x

=>x = 64

hope it helps

3 0
3 years ago
Write <br> 0.28<br> as a fraction in simplest form.
Usimov [2.4K]

7/25

First thing you want to do is put it over 100

28/100

Now divide by 4

28÷4=7

100÷4=25


6 0
4 years ago
Read 2 more answers
An old movie theater has seats on a main floor and in a balcony. The main floor has 26 rows of 29 seats in each row. The balcony
Archy [21]
The main floor has 26 rows of 29 seats each, that is 26*29 = 754 seats  
And in the balcony there is 8 rolls of 23 seats, that is 8*23 = 184 seats  
So the difference is 754 - 184 = 570   
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3 0
3 years ago
Can someone help me with this problem? thank you!
Ostrovityanka [42]

\qquad\qquad\huge\underline{{\sf Answer}}

Let's solve ~

\qquad \sf  \dashrightarrow \: c = \pi d

  • where, d = 2r = 2 × 5 = 10 cm

\qquad \sf  \dashrightarrow \: c = 3.14 \times 10

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4 0
2 years ago
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6m - 8 = 2 + 9m - 1 Show your work and answer.
Nookie1986 [14]

6m-8 = 2+9m-1

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