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rodikova [14]
3 years ago
6

Algebra 1!!

Mathematics
2 answers:
harkovskaia [24]3 years ago
8 0

Answer: (6, 3)

Explanation: Our first equation tells us that x means the same thing as 2y so we can replace the x in the second equation with a 2y.

Our second equation then becomes 2(2y) + 3y = 21.

If we simplify on the left side we get

4y + 3y = 21 which simplifies to 7y = 21.

Solving from here, we find that <em>y = 3</em>.

To find x, plug 3 back in for y in the first equation

to get x = 2(3) which simplifies to <em>x = 6</em>.

So our answer is (6, 3).

emmasim [6.3K]3 years ago
5 0

Answer:

\huge\boxed{b.\ x=6;\ y=3}

Step-by-step explanation:

\left\{\begin{array}{ccc}x=2y&(1)\\2x+3y=21&(2)\end{array}\right\\\\\text{Substitute (1) to (2):}\\2(2y)+3y=21\\4y+3y=21\qquad\text{combine like terms}\\7y=21\qquad\text{divide both sides by 7}\\\dfrac{7y}{7}=\dfrac{21}{7}\\\boxed{y=3}\\\\\text{Substitute it to (1):}\\x=2(3)\\\boxed{x=6}

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Answer:

91.5

Step-by-step explanation:

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4 0
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3x+6y=24 can someone help me ehat this
Sladkaya [172]
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6 0
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You have to spend money to make money ! You purchase a mix of newspaper ads and online ads. Each newspaper ad cost $18.50 and ea
SpyIntel [72]

Answer:

You buy six newspaper ads & eighteen social media ads.

Step-by-step explanation:

First, we change ads into variables to be more easier to calculate :

Let newspaper = x

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x + y = 24 (first equation)

Next, given that x = $18.50 & y = $26.50 & spent a total of $588 so you can make another equation :

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substitution =>

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6 0
3 years ago
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Answer:

-8 and the next box is -3

Im pretty sure thats right

Step-by-step explanation:

4 0
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Answer:

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3 years ago
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