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professor190 [17]
3 years ago
15

Solve the system. x + y = 8 2x2 – y = –5 Add the equations

Mathematics
2 answers:
mixas84 [53]3 years ago
6 0

Answer: Solve the system. x + y = 8 2x2 – y = –5 Add the equations, then choose the result. 3x2 = –13 3x2 = 3 2x2… Get the answers you need, now!

2 answers

 

·

 

Top answer:  

2x^2 - y = -5 x + y = 8----------------add2x^2 + x = 3 <==** 2x^2 and x cannot be add

Step-by-step explanation: HAVE A GREAT DAY

Leya [2.2K]3 years ago
5 0

Answer:

X+Y = 8

2X-Y =-5

(X+2X+Y-Y)=8-5

3X=3

X=1

Y:

1+Y=8

Y=8-1

Y=7

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Where does the line y=3x-5 cross the y axis?
makkiz [27]

Answer:

At (0, -5)

Step-by-step explanation:

The y-intercept (b) is -5 (<em>slope intercept form: y = mx + b</em>) the line will thus cross the y axis at the point (0, -5).

7 0
2 years ago
Write three numbers greater than 20 that have 9 as a factor
Lubov Fominskaja [6]
We just need to find the multiples of 9 that are greater than 20.

9*1 = 9
9*2 = 18
9*3 = 27 
9*4 = 36
9*5 = 45

We can use 27,36, 45, .....
Your final answer should be any multiple of nine greater than 20. I recommend using 27, 36, and 45. Hope this helps!<span />
6 0
3 years ago
Maya has 3 times as many dimes as nickels. She has 4 more quarters than nickels. if she has a total of $9.40, how many of each t
puteri [66]

Answer:  nickels = 14, dimes = 42, quarters = 18

<u>Step-by-step explanation:</u>

Let n represent nickels <em>which has a value of $0.05 </em>

Let d represent dimes <em>which has a value of $0.10</em>

Let q represent quarters <em>which has a value of $0.25</em>

It is given that:

                       n = n

                      d = 3n

                      q = n + 4

and their total value is $9.40    ⇒     n + d + q = $9.40

Use substitution to find the quantity of nickels:

.05(n) + .10(3n) + .25(n + 4) = 9.40

 5n    +  10(3n) +   25(n+4)   = 940           <em>multiplied by 100 </em>

 5n    +   30n   +  25n + 100 = 940          <em>distributed</em>

                            60n + 100 = 940          <em>added like terms</em>

                            60n           = 840          <em>subtracted 100</em>

                                 n           = 14            <em>divided by 60</em>

n = 14

                d = 3n

                   = 3(14)

                   = 42

                                       q = n + 4

                                          = (14) + 4

                                           = 18

4 0
3 years ago
What’s Volume of a cylinder if the height is 10 diameter is 3
Art [367]

Known :

h = 10

d = 3

Asked :

V = ...?

Answer :

V = ¼πd²h

= ¼ × 3.14 × 3² × 10

= ¼ × 3.14 × 9 × 10

= <u>7</u><u>0</u><u>.</u><u>6</u><u>5</u>

<em>Hope </em><em>it </em><em>helpful </em><em>and </em><em>useful </em><em>:</em><em>)</em>

7 0
3 years ago
A car costs $9,000. If Mr.Smith has saved 20% of this amount, how much did he save?
olga2289 [7]

Answer:

the answer for your question would be 1800

Step-by-step explanation:

you multiply 9000 times by .20

5 0
3 years ago
Read 2 more answers
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