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3 years ago

What is y=2x+4 and 3x+y=9 substitution method

Mathematics

1 answer:

soldier1979 [14.2K]3 years ago

8 0

You plug in 2x + 4 into the y for the other equation (3x +y ) and solve for it

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I cant see the answers anyone else has the problem

Jet001 [13]

Answer: im having the same problem

Step-by-step explanation:

7 0

3 years ago

a jar contains nickels and pennies. there are 56 coins in the jar in all. the total value of the coins is 1.52. how many pennies

nevsk [136]

1 penny is just 1c
one nickel is 5 pennies or 5c

alrite...

p = amount of pennies in the jar
n = amount of nickels in the jar

we know there are 56 coins in the jar, thus whatever "p" and "n" are,

p + n = 56

we also know, the total value of all pennies and nickels is one buck and 52 cents, or 1.52.. that's 152 pennies.

now, we know there are 5 pennies in one nickel, so in "n" nickels, there are 5*n pennies, or 5n, thus

p + 5n = 152

$\bf \begin{cases}
p+n=56\implies \boxed{n}=56-p\\
p+5n=152\\
----------\\
p+5\left( \boxed{56-p} \right)=152
\end{cases}$

solve for "p", to see how many penny coins are there.

what about the nickels? well, n = 56 - p.

5 0

3 years ago

Is the difference between a positive mixed number and a negative mixed number always, sometimes, or never positive?

Annette [7]

Ok It depends upon what the order of the terms might be

If we consider that the positive mixed number is the first term and the negative mixed number is the second term and we consider "difference" to be subtraction.....then the result is positive

For example

(3 + 1/2) - [ -(1 + 1/2)] =

(3 +1/2) + (1 + 1/2) = 5 since subtracting a negative results in a positve

But....if we had the reverse order with the same operation, we would have

-(1 + 1/2) - (3 + 1/2) and the result is - 5

Hence.......I would go with "sometimes"

5 0

2 years ago

In a volatile housing market, the overall value of a home can be modeled by V(x) = 210x2 – 4400x + 125000, where V represents th

Grace [21]

Answer:

I think a picture can explain better than me!

Step-by-step explanation:

Have a good day.

7 0

2 years ago

SHOW YOUR WORK,Solve this system of equations for x using the addition method

maria [59]

Answer:

NUMBER 1.)

Step 1

Subtract 3y3y from both sides.

5x=10-3y5x=10−3y

Step 2

Divide both sides by 55.

\frac{5x}{5}=\frac{10-3y}{5}

10−3y

Hint

Undo multiplication by dividing both sides by one factor.

Step 3

Dividing by 55 undoes the multiplication by 55.

x=\frac{10-3y}{5}x=

10−3y

Hint

Undo multiplication.

Step 4

Divide 10-3y10−3y by 55.

x=-\frac{3y}{5}+2x=−

Hint

Divide.

Solution

x=-\frac{3y}{5}+2x=−5

3y+2

Step-by-step explanation:

NUMBER 2.)

Step 1

Add 4y4y to both sides.

3x=6+4y3x=6+4y

Step 2

The equation is in standard form.

3x=4y+63x=4y+6

Step 3

Divide both sides by 33.

\frac{3x}{3}=\frac{4y+6}{3}

4y+6

Hint

Undo multiplication by dividing both sides by one factor.

Step 4

Dividing by 33 undoes the multiplication by 33.

x=\frac{4y+6}{3}x=

4y+6

Hint

Undo multiplication.

Step 5

Divide 6+4y6+4y by 33.

x=\frac{4y}{3}+2x=

Hint

Divide.

Solution

x=\frac{4y}{3}+2x= 3

4y+2

4 0

2 years ago