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Mekhanik [1.2K]

2 years ago

15

) A store is having a 30% off sale. Michelle uses the expression 0.7p and Stuart uses the expression p-0.3p. Who is using the co

rrect expression?

1 answer:

Aleonysh [2.5K]2 years ago

3 0

Answer:michelle

Step-by-step explanation: it is 70% of the cost since it’s 30% of the original

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Solve for x: 4x(3y-2)=7x+11

kupik [55]

Answer:

x=11(12y-15)

Step-by-step explanation:

4x(3y-2)=7x+11

12xy-8x=7x+11

12xy-8x-7x=11

12xy-15x=11

x(12y-15)=11

x(12y-15)/(12y-15)=11/(12y-15)

x=11/(12y-15)

7 0

3 years ago

Read 2 more answers

Using like terms simplify-k+2(-2k-5)

MrRa [10]

Answer:

-5k-10

Step-by-step explanation:

- k + 2 (- 2k - 5) = - k - 4k - 10 = - 5k - 10

5 0

3 years ago

Solve the following system of equations<br>2x – 3y = 6<br>4x+2y=4

FinnZ [79.3K]

Answer:

$\boxed{(\frac{3}{2} ,-1)}$

Step-by-step explanation:

$\left \{ {{2x-3y=6} \atop {4x+2y=4}} \right.$

It seems this system of equations would be solved easier using the elimination method (the x and y values are lined up).

Multiply everything in the first equation by -2 (we want the 4x to be able to cancel out with a -4x).

$2x-3y=6 \rightarrow -4x+6y=-12$

Now line up the equations (they are already lined up - convenient) and add them from top to bottom.

$\left \{ {{-4x+6y=-12} \atop {4x+2y=4}} \right.$

The -4x and 4x are opposites, so they cancel out.

Adding 6y and 2y gives you 8y, and adding -12 and 4 gives you -8.

$8y=-8$

Divide both sides by 8.

$y=-1$

Since you have the y-value you can substitute this in to the second (or first equation, it doesn't necessarily matter) equation.

$4x +2(-1)=4$

Simplify.

$4x -2=4$

Add 2 to both sides.

$4x=6$

Divide both sides by 4.

$x=\frac{6}{4} \rightarrow\frac{3}{2}$

The final answer is $x=\frac{3}{2} ,~y=-1$ .

$(\frac{3}{2} ,-1)$

5 0

3 years ago

Write an expression that represents the product of a variable and a negative number

lbvjy [14]

-6x because this expression represents the product of a negative number (-6) and a variable (x).

4 0

3 years ago

An HP printer costs $180, with printing costs of $0.03 per page. A Samsung printer costs $230, with printing costs of $0.01 per

Softa [21]

Answer:

2,500 pages

Step-by-step explanation:

Let

y -----> the overall cost

x -----> the number of pages

we know that

HP printer

$y=0.03x+180$ ------> equation A

Samsung printer

$y=0.01x+230$ -----> equation B

Solve the system by substitution

Substitute equation B in equation A

$0.03x+180=0.01x+230$

Solve for x

$0.03x-0.01x=230-180\\0.02x=50\\x=2,500\ pages$

8 0

2 years ago