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3 years ago

3. Solve for y: -5x + 2y = 14

Mathematics

2 answers:

Ludmilka [50]3 years ago

7 0

Answer:

i am not sure ... i usually use this app and is correct ...

galben [10]3 years ago

4 0

Y is 7+5x divided by 2

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The sale price of every item in a store is 85% of its usual price.

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3 years ago

Solve the following systems of linear equations using the substitution method

Bess [88]

X= 1
y=-2
this is the answer

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3 years ago

-7x=63<br> Please show full work

STALIN [3.7K]

Answer:

x=70

Step-by-step explanation:

1)Write equation

2)Put line through equal sign

3) under -7n add 7

4)add 7 to 63 also

5)answer 63+7=70

6)x=70

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3 years ago

Read 2 more answers

The owner of a grocery store wants to mix two kinds of condy together to make 15lb that he can sell for $5.00 per lb. He wants t

ankoles [38]

Answer: 6 pounds of sugar candy, and 9 pounds of chocolate candy.

Step-by-step explanation:

Let's define the variables:

C = pounds of chocolate candies used.

S = pounds of sugar candies used.

We know that he wants to make a total of 15lb, then:

C + S = 15

We also want that the price per pound to be equal to 5$.

This means that the price of the 15 pounds will be the same as the price of the un-mixed candies.

C*$7.00 + $2.00*S = $5.00*15

Then we have a system of equations:

C + S = 15

C*$7.00 + $2.00*S = $5.00*15

To solve this system, we need to start by isolating one of the variables, i will isolate C in the first equation:

C = 15 - S

now we can replace that in the other equation:

(15 - S)*$7.00 + $2.00*S = $5.00*15

Now we can solve this for S.

$105 - $5.00*S = $75

$105 - $75 = $5.00*S

$30 = $5.00*S

$30/$5 = S = 6

Then there are 6 pounds of sugar candy, and we can use the equation:

C + S = 15

C + 6 = 15

C = 15 - 6 = 9

There are 9 pounds of chocolate candy in the mix.

3 0

3 years ago

Read 2 more answers

Solve the system using substitution:<br> X+Y=5<br> Y=X - 9

makvit [3.9K]

Answer:

x = 7

y = -2

Step-by-step explanation:

There are 2 equations. The substitution method takes one equation and puts it into the other and solves for 1 variable. Then you take that answer and put into any one equation and solve for the other variable.

Since equation #2 is already given for y = SOMETHING, we take that something and put it into "y" of the 1st equation. Shown below:

$x+y=5\\x+(x-9)=5\\x+x-9=5\\2x=5+9\\2x=14\\x=\frac{14}{2}\\x=7$

We got x = 7

Now, we know from Equation #2, y = x - 9, so

y = x - 9

y = 7 - 9

y = -2

Hence,

y = -2

In coordinate pair, the answer is (7, -2)

3 0

3 years ago