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aev [14]
3 years ago
9

Substitution algebra

Mathematics
1 answer:
Mekhanik [1.2K]3 years ago
7 0
<h2>Answer:</h2>

We will use substitution to solve the system. Step 1 is partially complete.

y = -2x - 9\\6x - 5y = -19\\\\6x - 5(-2x - 9) = -19\\\\6x + 10x + 45 = -19\\\\16x + 45 = -19\\\\16x = -64\\\\x = -4

We will now use what we got for x to solve for y in one of the original equations.

6(-4) - 5y = -19\\\\-24 - 5y = -19\\\\-5y = 5\\\\y = -1

The solution is (-4, -1).

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Answer:

Step-by-step explanation:

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From here we will be able to calculate for those that signed up for only English class: Total number of students that signed up for english class

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b. How many signed up for neither Math nor English meaning they signed up for only sports which is 70 from the venn diagram in the attachment.

c. How many signed up for an English class and at least one other class?

From the venn diagram:

we could have an English class and maths class - 100

we could also have an a English class and sports - 50

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From the diagram, 180 (english and sport, maths and sport and english and maths) enrolled for two classes = 180 x $150 = $27,000

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