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3 years ago

2x - y = 3 y = -x What’s the value of x?

Mathematics

2 answers:

pashok25 [27]3 years ago

6 0

Answer:

X = 1 which means Y = -1

Step-by-step explanation:

2x - y = 3

y = -x

Sub for y

2x + x = 3

Add the x's

3x = 3

Divided by 3

x = 1

zlopas [31]3 years ago

3 0

Answer:

These are simultaneous equations.They have to be solved like this:

2x-y=3 -y=3-2x 2x-3= -x

y= -x y= -(3-2x) 3x= 3

y=2x-3 x=1

Step-by-step explanation:

The value of x equals to 1

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Need help with simplifying expressions

Ilia_Sergeevich [38]

Answer:

A) -20

Step-by-step explanation:

distribute the 4y and the -4 to the parentheses

16y^2 -16y+16y-20-16y^2

combine like terms

16y^2-16y^2=0

-16y+16y=0

-20

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2 years ago

Read 2 more answers

What is the square root of 98/2

timurjin [86]

Answer:

Step-by-step explanation:

$\sqrt{ \frac{98}{2} } = \sqrt{49 } = 7$

I hope it helped you

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2 years ago

Look at pic plz help

jasenka [17]

Answer:

Mochi

Step-by-step explanation:

Mochi

Each week theres a increase of 4 in Mochi's weight. So you will add 4 twice to get to the 5th week.

4th week : 17

5th week : 21

Kappa

In 4 weeks Kappa weighed 14, which is less that Mochi at the pace Kappa is going at.

on the 3rd week Kappa weighed 11

and 2nd week Kappa weighed 5

and 1st week Kappa weighed 3

Looking at the graph, we can give a rough estimate on the 5th week it's going to be 16 or 17 either way making Mochi heavier.

8 0

2 years ago

A cashier has 26 bills consisting of three times as many ones as fives, one less ten than fives, and the rest twenties. If the v

monitta

Let number of fives = x then number of ones = 3x and number of tens = x - 1

so we can create the equation

x + 3x + x-1 + y = 26 where y = number of twenties
so
5x + y = 27

also we have the equation

5x + 3x + 10(x - 1) + 20y = 120

18x + 20y = 130..................................(1)
5x + y = 27 multiply by -20:-
-100x - 20y = -540..............................(2)
Adding equation (1) and (2)
-82x = -410
x = 5, that is 5 fives

Now plug x = 5 into equation 1:-
18(5) + 20y = 130
20y = 40
y = 2 , that is 2 twenties

So the answer is there are (3x) = 15 ones , 5 fives, 4 tens and 2 twenties

7 0

3 years ago

Divide 72kg in a ratio of 1:3:5

77julia77 [94]

Add together your portions 1 + 3 + 5 = 9 divide 72 by 9 = 8 Each portion is multiplied by 8 1 x 8 = 8 3 x 8 = 24 5 x 8 = 40 Your portions are 8kg:24kg:40kg Is this correct? Add 8 + 24 + 40. Do they equal 72? yes. Your portions are correct.

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3 years ago