MATHEMATICS MIDDLE SCHOOL

How to do this equation by elimination 8x +14y= 4 and -6 + -7y =-10

Answers

Answer 1
Answer: 8x + 14y = 4
-6x - 7y=-10  / *2

8x + 14y=4
-12x -14y= -20
_________________
-4x=-16 => x=4; y= -2
Answer 2
Answer:

Answer:

y=4/7, x=-1/2

Step-by-step explanation:

Elimination is when you add the equations together

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Which statement correctly compares 8/15 and 5/8 A. 8/15 > 5/8 B. 8/15 < 5/8 C. 8/15 = 5/8

15-12 divided by 3= n. what is the value of the unknown number

Answers

15 -12 is equal to 3 and 3 divided by 3 is 1 so n is equal to 1 :)))
i hope this is helpful
have a nice day 

What is the solution for this equation 13m-22=9m-6. This is a equation with variables on both sides

Answers

13m-22=9m-6
4m-22=-6
4m=16
m=4
13m-22=9m-6
13m-9m=22-6  <-- integer signs change when it goes to the other side of the  equal to sign
4m=16
m=16/4
m=4    

How is 0.80 greater and 0.8 smaller please be as detailed as you can :) Stretch your thinking always gets me :)

Answers

His error is that while 80 is greater than 8, 0.80 = 80/100 = 8/10 and 0.8 = 8/10, so they are equivalent. 

Cheese sticks that were previously priced at "5 for $1" are now "4 for $1". Find the percent increase in the price per cheese stick.

Answers

Answer

Find out the percent increase in the price per cheese stick.

To prove

As given

Cheese sticks that were previously priced at  "5 for $1" are now "4 for $1".

i.e previously the price of the 5 cheese stick is $1 .

one\ cheese\ sticks\ price = (1)/(5)

                                      = 0.2

Now the price of the 4 cheese stick is $1 .

one\ cheese\ sticks\ price = (1)/(4)

                                      = 0.25

Change in price per cheese stick =  now price - previous price

                                                       = 0.05

Formula

Percentage\ increase = (Change\ in\ price\ per\ cheese\ stick* 100)/(Previous\ price\ per\ cheese\ stick)

Put all the value in the formula

Percentage\ increase = (0.05* 100)/(0.2)

                                            = 25%

Therefore the percent increase in the price per cheese stick is 25%.



                                               
the price of cheese sticks went from 5 for $1 ( $0.20) to 4 for $1 ($0.25)
.25-.20= .05
.05/.20= 25% increase in price per cheese stick

What is the intercept of the line y=-1/4x+3

Answers

Answer:

y-intercept: (0,3); x-intercept: (12,0)

Step-by-step explanation:

The y-intercept is in a line where x = 0, so to find it, you can plug in 0 for x in the equation.

y = -¹/₄(0) + 3

y = 0 + 3

y = 3

So when x = 0, y = 3, therefore the y-intercept is (0,3)

The x-intercept is when y = 0, so plug in 0 into y

0 = -¹/₄x + 3

-3 = -¹/₄x

x = 12

So when  = 0, x = 12, therefore the x-intercept is (12,0)

Answer:

(0,3)

Step-by-step explanation:

y = -1/4 + 3

The intercept is (0,3)

sonya can walk 12 kilometers in 4 hours. If she has to walk 15 kilometers, how much time will it take her?

Answers

First, We Should Find The Unit Rate...
12 kilometers
------------------
    4 hours
We Need To Simplify. 12/4 Can Be Simplified To 3/1. So, 3 kilometers/1 hour is the unit rate. Now, We Need To Change It To 15/X. 
15       3
----  = ----
 X        1
Solve For X. To Solve, Multiply Means And Extremes. The Equation Becomes: 
3X = 15*1.
Simplify.
3x = 15.
Now, Divide Both Sides By 3.
X = 15/3.
15/3 = 5. 
X = 5.
So, Sonya Can Walk 15 Kilometers In 5 Hours. :D
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