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salantis [7]
3 years ago
14

3x = -y + 12 2x + 3y = -6

Mathematics
1 answer:
tangare [24]3 years ago
3 0

Answer:

3x=-y+12

2x+3y=-6

collecting the like terms we have

3x+y=12

2x+3y=-6

to solve this simultaneous equation, we use substitution method

we make y the subject in equation one:

y=12-3x

then we put y=12-3x into 2x-3y=-6 in equation two

2x+3(12-3x)=-6

2x+36-9x=-6

-7x+36=-6

-7x=-6-36

-7x=-42

x=-42÷-7

x=6

then we put x=6 in y=12-3x:

y=12-3x

y=12-3(6)

y=12-18

y=-6

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Answer:

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Step-by-step explanation:

Hi!

Alright, so greater (or less) than or equal to is denoted with a bracket.

If x is less than or equal to -4, then the bracket is on the left side.

(___, -4]

Because x is <em>any</em> number under or equal to -4, x can range from negative infinity. However, we use a parentheses for infinity because infinity can never truly be reached.

So, x \leq -4 = (-∞, -4]

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X is any number above 5, so

[5, ∞)

Because we want both of these, we use the union sign (∪)

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3 years ago
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3 years ago
Find the value of f(-8).
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Step-by-step explanation:

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You got everything correct so far except for #4.

4. Yes, it is 1. But it would be in months.

So you would put:

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3 years ago
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