How to solve 2x+y=2 and x+y=-1

Answers

Answer 1

Answer: so
2x+y=2
x+y=-1

multiply secion equation by -1
-x-y=1

add to first equation

2x-x+y-y=2+1
x=3
subsitute
3+y=-1
subtract 3
y=-4

x=3
y=-4

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Identify which are functions True or False.

What is the missing value from the table

Answers

Answer:12

Step-by-step explanation:In the table you can see that the numbers given under Y

Are in a pattern counting by sixes so if you do 6×3 you get 18 for missing the second one so we do 6×2 which equals 12 and that is the answer.

The answer is going to be 12.

Which pair of fractions is equivalent to this pair? 2/9 and 3/7

Answers

an equivalent fraction for 2/9 is 4/18
and for 3/7 you have 6/14
I got it by multiplying both fractions by 2

The start time is 2:00 the end time is 8:30 what is the elapsed time? please help me

Answers

6:30
8:38
- 2:00
______
6:30

Hope that helps

A cone has a diameter of 12 in. and a height of 16 in.What is the volume of the cone?

Use 3.14 as an approximation for pi and express your final answer in hundredths.

Answers

V=πr² $(h)/(3)$

Radius = 12/2 = 6 in
Height = 16 in

V = 3.14*6²*16/3
V = 602.88

The volume would be: Volume = 602.88 in^3

The formula for the Volume of a Cone is $(1)/(3)$ $\pi$ r²h
Let us substitute:
V= $(1)/(3)$ ×3.14×6²×16
=602.88 in³
The radius is half the diameter.(12in=d,r= $(d)/(2)$ = $(12)/(2)$ = 6 in)
pi was taken as 3.14

2h=w-3p
What does p equal?

Answers

2h-w/-3=p because you put everything on the other side except what your solving for.

Solve for 3 begin by subrating 3 from bth sides

Round to the given place value hundreds and tens 547 , 609 and 990

Answers

the first number will be 500
the second number will be 600
and the last number will be 990

1. 500, 550
2. 600, 610
3. 1000, 910

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Least to greatest fractions 1/2, 2/5, 6/10

Order the number from greatest to least 16.4,1.64,1.6,16.099

Solve 12x + 6 > 9x + 12.

What is the product? (5r − 4)(r2 − 6r + 4)A. 5r3 − 34r2 + 44r − 16 B. 5r3 − 4r2 + 14r − 16 C. 5r3 − 6r − 16 D. 5r3 + 10r − 16