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3 years ago

Solving the following system using the elimination method. 2x+y=-9 2x-5y=-3

Mathematics

2 answers:

leonid [27]3 years ago

8 0

Broke MB did he ryghdjd off rijekrjrirjriirjt

Stells [14]3 years ago

7 0

Answer:

x = -57/14, y = -6/7

Step-by-step explanation:

2x + y = -9

-(2x - 5y = -3)

-------------------- (Add the two equations together)

7y = -6

y = -6/7

2x - 6/7 = -9

2x = -57/7

x = -57/14

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Steven is x years old. John is 3 years older than Steven. In terms of x, how old will John be in 6 years?

Mumz [18]

Answer:

Step-by-step explanation:

6 + 3=9

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4 years ago

) A coin collection consisting of pennies, dimes, and quarters totals 45 coins. The number of

Sloan [31]

9514 1404 393

Answer:

$7.14

Step-by-step explanation:

Let p, d, q represent the numbers of pennies, dimes, and quarters in the collection, respectively.

p + d + q = 45 . . . . . . . . there are 45 coins in the collection

2p +5 = q . . . . . . . . . . . . 5 more than twice the number of pennies

p + 4 = d . . . . . . . . . . . . . 4 more than the number of pennies

Substituting the last two equations into the first gives ...

p +(p +4) +(2p +5) = 45

4p = 36 . . . . . . . . . . . . . subtract 9

p = 9 . . . . . . . . . . . divide by 4

d = 9 +4 = 13

q = 2(9) +5 = 23

The value of the collection is ...

23(0.25) +13(0.10) +9(0.01) = 5.75 +1.30 +0.09 = 7.14

The coin collection is worth $7.14.

5 0

3 years ago

True or false 6 to the 3 power = 216

timofeeve [1]

Answer:

True

Step-by-step explanation:

6^3, or 6x6x6, is equal to 216.

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hope it helps

5 0

3 years ago

Read 2 more answers

The following statement is either true (in all cases) or false (for at least one example). If false, construct a specific e

matrenka [14]

Answer:

False, counterexample below

Step-by-step explanation:

Denote the unit vectors of R^3 by $e_1=(1,0,0), e_2=(0,1,0), e_3=(0,0,1)$ . Now consider $v_1=e_1, v_2=2e_1$ and $v_3=e_3$ . We have that $v_1, v_2,v_3 \in \mathbb{R}^3$ . Also, the vector $v_3$ is not a linear combination of $v_1, v_2$ because any linear combination of these two vectors will have third coordinate zero, but v_3 has third coordinate 1 so they can't be equal.

However, the set $\{v_1, v_2,v_3\}$ is not linearly independent, because $2v_1-v_2+0v_3=0$ is a non-trivial linear combination of these vectors that equals zero.

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4 years ago

25/100 simplest form

Gnom [1K]

25/100 is 1/4 in similest form

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3 years ago

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