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Studentka2010 [4]
3 years ago
8

Which graph is a function, and explain how you knew whether each graph was a function or not.

Mathematics
1 answer:
romanna [79]3 years ago
7 0
C is a function. You can tell easily by doing the vertical line test. Put your finger pen pencil, etc. up to the graph vertically and see if at any point it touches more than one point at once. If it doesn't, it's a function.
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Which could be the first step in solving this system of equations by substitution?
Ainat [17]

Answer:

The first step is to replace the y in y-x=15 with 7x (we can do this because the first equation tells us that they're equal)

solve and get

(2.5,17.5)

or x= 2.5 y=17.5

Step-by-step explanation:

The first step is to recognize that y=7x which means that we can just replace the y in the second equation with 7x

7x-x=15

6x=15

x=2.5

Then we can solve for y

y=7(2.5)

y=17.5

3 0
3 years ago
A 20-kilogram object falls 2.0 meters to the floor. At what point in its fall
professor190 [17]

Answer:

half way to the floor

Step-by-step explanation:

4 0
3 years ago
Find the equation of the straight line that passes through points (-1; -2) and (3; 4)
Leya [2.2K]
Y=mx+b is our base equation

m=slope, so let's find that first:
m= change in y/change in x
So between the points (-1,-2) and (3,4),
The y values, -2 and 4, have a difference of 6. The x values, -1 and 3, have a difference of 4. This makes our slope 6/4 (or 3/2 simplified)

Now our equation is
Y=3/2x + b

We still need to find b
To find b, we can substitute a point given to us. Let's use (3,4) just to avoid negatives.

4=3/2(3) + b
Multiply
4=9/2 + b
Subtract 9/2 from both sides
-1/2=b

Now let's put it all back together!

Y=3/2x-1/2 Is the answer.

I hope this Helps!


6 0
3 years ago
1) An ice cream factory makes 320 quarts of ice cream in 10 hours.
zzz [600]
320 qts/10 hrs = 32 qts/1 hr 

They can make 384 quarts in 12 hours.

They can make 768 quarts per day (24 hours) if they open 24 hours.
8 0
3 years ago
Read 2 more answers
How do you do this?PLZ HELP
Alisiya [41]
3(x^2+10x+5)-5(x-k)=
3x^2+30x+15-5x+5k=
3x^2+25x+15+5k

for this to be divisible by x every term must include x or get eliminated

the problematic terms are 15 and 5k
to eliminate them they must equal 0 when added:
15+5k=0
5k=-15
k=-3

so A) -3 is the solution
5 0
3 years ago
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