X+y=-4 x-y=2 Use elimination with adding and subtraction

1 answer:

6 0

ANSWER

$x=-1,y=-3$

EXPLANATION

The given equations are:

$x + y = - 4...(1)$

and

$x - y = 2...(2)$

If we add equation (2) to equation (1) we get,

$x + x - y + y = 2 + - 4$

This implies that,.
$2x = - 2$

Divide both sides by 2 to get,

$x = - 1$

We put x=-1 into equation 1 to get,

$- 1 + y = - 4$

We solve for t to get,

$y = - 4 + 1$

This implies that,

$y = - 3$

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Water pressure increases 0.44 pounds per square inch (0.44 psi) with each increase of one foot in depth below sea level. Identif

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Answer:

Depth below sea level is the independent quantity,

Water pressure is the dependent quantity

Step-by-step explanation:

An independent quantity is a variable that can be changed in an experiment. While, dependent quantity results from the independent quantity or we can say, that depends upon the independent quantity.

Here,

The water pressure increases 0.44 pounds per square inch (0.44 psi) with each increase of one foot in depth below sea level,

So, for measuring the water pressure we took depth below sea level as a variable,

⇒ Depth below sea level is the independent quantity,

While, with increasing depth by 1 foot the pressure is also increase by 0.44 pounds per square inches ⇒ pressure depends upon the depth

⇒ Water pressure is the dependent quantity.

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