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Coordinates 4x+2y=8

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This is an equation of a straight line, and we can easily find the the coordinates where this line intersects the axis in following ways:-

for x-axis:-
put y=0, 4x+2*0=8
4x =8
x =8/4
x =2
so intersection coordinates ate (2, 0)

for y-axis:-
put x=0, 4*0+2y=8
2y =8
y =8/2
y =4
so intersection coordinates ate (0, 4)

Thanks

Zulfikar ali
ali_zulfikar@yahoo.com
9899780221

Posted on Feb 06, 2009

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1 Answer

Substitute 4 and -4 for x in the equations y=x+1 and 2y-2=2x. Describe the results


y = x+1
y = (4) + 1
y = 5

y = x + 1
y = (-4) + 1
y = -3

2y - 2 = 2x
2y - 2 = 2 (4)
2y - 2 = 8
2y - 2 + 2 = 8 + 2
2y = 10
2y/2 = 10/2
y = 5

2y - 2 = 2(-4)
2y - 2 = -8
2y -2 + 2 = -8 + 2
2y = -6
2y / 2 = -6 /2
y = -3

The results are the same, implying that they are the same line.

Why?

2y - 2 = 2x
2y - 2 + 2 = 2x + 2
2y = 2x + 2
divide everything by 2
y = x + 1

Good luck,

Paul

Feb 07, 2017 | The Office Equipment & Supplies

1 Answer

Do i use the elimination or substitution method for the equations 16x-2y=16 and 4x=2y-8


Both should work.

16x - 2y = 16
4x - 2y = -8
-----------------
12x = 24
x = 2
y = 8

2y=4x + 8
y = 2x + 4
16x - 2(2x + 4) = 16
16x - 4x -8 = 16
12x = 24
x = 2
y = 8

Good luck.

Paul

Oct 05, 2014 | Office Equipment & Supplies

1 Answer

Mary who is sixteen years old is four times as old as her brother.How old will mary be when his twice as old as her old brother?


Let the brother's age be x:
16years for Mary = 4x years for Brother

From equation: 4x = 16
x = 4
Therefore, the brother is 4 years old.

Mary Brother
16 4
After 4 years + 4 4
20 8
After the next 4 years + 4 4
24 12

24 is twice as old as 12; therefore for the sister to be twice as old as brother she will 24years when her brother is 12 years.

Or by calculation;

If 4 is the age for the brother, when the sister is 16, and y years will pass for the to be such that the sister is twice as old as the brother, then;

16 + y = 2(4 + y)
16 + y = 8 + 2y
16 - 8 = 2y - y
8 = y
Therefore, 8 years elapse before the sister is twice as old as the brother.

Sister will be: (16 + 8) = 24years
Brother will be: (4 + 8) = 12years

Aug 02, 2011 | Computers & Internet

2 Answers

2x - 4y = 20 4x + 2y = -20


This should start wit X=something and Y=something, sorry I'm not an human algebra calculator....

Jul 29, 2011 | Computers & Internet

1 Answer

What is the y-intercept of a line with an equation 8x-8+2y=0?


8x - 8 + 2y = 0
8X + 2Y = 8
y = -4x + 4
X = 0 por y-intercept
y=mx+b
Y = 8/2 or 4
Knock knock
Who's there?
4
4 who?
Why yall want me to do yall's homework 4?
themobilian_650.jpg
Do the math on that! LOL

Jan 02, 2011 | Kitchen Ranges

2 Answers

Why is the y-intercept of the graph of 4x+2y=12?


use the slope-intercept form to graph y=2/3x+4

Mar 31, 2010 | Computers & Internet

1 Answer

4x+8y=20 -4x+2y=-30


4x+8y=20 || /4
x+2y=5
x=5-2y

-4x+2y=-30 || /2
-2x+y=-15
-2(5-2y)+y=-15
-10+4y+y=-15
5y=-5
y=-1

x=5-2y || y=-1
x=5-2(-1)
x=5+2
x=7

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2 Answers

Find the y coordinate in the solution of -3x+y=5 if x=1


This is the process of how you would solve this.

-move the -3x over to the right hand side, so you have:
y = 5 + 3x

- since you know what x is, plug in the x which is 1:
y = 5 + 3(1)

- solve the equation
y = 5+3

y = 8, so the solution is 8.

Dec 16, 2008 | SoftMath Algebrator - Algebra Homework...

3 Answers

Solving systems of equations by elimination


Hi joanmae jmeh;

You can add these equations just like you would numbers

3x + 2y = 7
5x - 2y = 1
-----------------------
8x =8
x=1
Now plug x = 1 back into either equation and you can solve for y
Y = 2

When you add the 2 equations together the +2y and the -2y cancel
out

Hope this helps Loringh Please leave a rating for me Thks

Dec 01, 2008 | Bagatrix Algebra Solved! 2005 (105101) for...

5 Answers

Algebra 1


B. 2((2-Y)/3)-Y=3
2(2-Y)-Y=9
4-2Y-Y=9
-3Y=9-4
-3Y=5
-Y=5/3
Y=-1.67

A. 3X+(-1.67)=2
3X-1.67=2
3X=2+1.67
3X=3.67
X=3.67/3
X=1.22

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