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3 years ago

Solve the system by graphing. {-2x=2y-4, 2x-y=-5

Mathematics

1 answer:

Phantasy [73]3 years ago

5 0

x=(2y-4)/-2

x=-y+2

2(-y+2)-y=-5

-2y+4-y=-5

-3y+4=-5

-3y=-9

y=3

x=-y+2

x=-3+2

x=-1

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8. Is the following statement true or false? Justify your conclusion. If a and b are nonnegative real numbers and a + b =0, then

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Answer:

If $a + b = 0$ then $a = 0$ and $b =0$

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Step-by-step explanation:

Considering the following conditions for the real numbers:

$a\geq 0\\b\geq 0$

Following the rules of these in-equations, it is possible to deduce:

$a + b \geq 0$

Then, if the proposed statement is:

$a + b = 0$

The conditions above shall comply the requirements established, but first, analyzing the statement:

If $a \geq 0$ and $b \geq 0$ then $a + b \geq a$ , $a + b \geq b$ and $a + b \geq 0$ .

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According to that, if $a + b = 0$ , then $a = 0$ and $b = 0$ .

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Answer:

Step-by-step explanation: 3 x 4 = 12.

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Y = kx

Plug in what we know:

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Plug this back into the equation along with y = 15:

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15 = 0.625x

Divide 0.625 to both sides:

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3 years ago

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