5x+3y=-9
-2x+y=8
The first step is the trickery (and quite frankly, hardest to explain) part. You need to multiply one equation by a number that will create one variable to be the negative version of the other...(Confusing, right? Don't worry, I'll show you)
We are going to solve for X first.
We will multiply the second equation by -3
5x+3y=-9
-3(-2x+y)=(-3)8
Now simplify:
5x+3y= -9
6x-3y= -24
Now combine the two equations (add them together)
11x= -33
Divide by 11
X=-3
Now plug X in to one of the first equations:
5(-3)+3y= -9
-15+3y =-9
3Y= 6
Y= 2
So your final answer is:
x= -3
Y= 2
Hope this helps!
<h3>
Answer: D) It is affected by tides.</h3>
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Explanation:
An estuary is where a river pours into the ocean. So that means fresh water mixes with salt water here. This allows us to rule out choices A and B.
According to NOAA, their site says "Estuaries are one of the most productive ecosystems in the world, so there is a great diversity of animals and plants that live there". In other words, a lot of plants and animals live here, so we can rule out choice C.
Choice D is the answer because tides do affect estuaries. This is simply because the ocean is pretty much right next to it, or attached to it. So it's expected that a high tide would cause the water level in an estuary to increase.
Answer:
the answer is 25
Step-by-step explanation:
because (4x-25) is equal to 75
so put the equation together and solve for x
4x-25=75
+25= 75+25
4x=100
x=25
To solve this you would make a triangle, Assuming you had a piece of paper.
It would look like the picture included (where ever that is) sorry for the horrible drawing with mouse.
You can then you Pythagorean Theorem to solve this
width will be (a)
put in your variables
Subtract 5184 over and get
square root both sides and get
a=54
the field is 54 meters wide
Answer:
184
Step-by-step explanation:
bottom rectangle area = 16 x 10 = 160
middle rectangle area= 3 x 4 = 12
Top triangle= 1/2(bh) = 8 x 3 = 24 (1/2) = 12
160+ 12 +12= 184
