MATHEMATICS HIGH SCHOOL

15x - 12y =13
30x +9y =4
whats the value of x

Answers

Answer 1
Answer: \left \{ {{15x-12y=13\ \ | multiply\ by\ -2} \atop {30x+9y=4\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }} \right. \n\n \left \{ {{-30x+24y=-26} \atop {30x+9y=4}} \right.\naddition\ method\n\n33y=-22\ \ \ \ | divide\ by\ 33\n\ny=-(22)/(33)\n\n15x=13+12y\n\nx=(13+12y)/(15)=(13+12*(-(22)/(33)))/(15)=(13-(264)/(33))/(15)=(13-8)/(15)=(1)/(3)\n\nSolution \ is\ x=(1)/(3).
Answer 2
Answer: so assuming that x and y are the same value in both equations we can make the first equation negative (multiply the whole thing by -1) and get

-15x+12y=-13
we multiply it by 2 and get
-30x+24y=-26
we add this to the second equation
(30x+9y=4)+(-30x+24y=-26)
30x-30x+24y+9y=-22
or 33y=-22
divide both sides by 11
3y=-2
divide both sides by 3
y=-2/3

we subtitute it into the first equation
15x-12(-2/3)=13
15x-(-24/3)=13
15x+8=13
subtract 8 from both sides
15x=5
divide both sides by 5
3x=1
divide both sides by 3
x=1/3

so x=1/3
y=-2/3

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Change x + 2y = 6 into slope-intercept form.

Answers

The equation of the line x + 2y = 6 in slope-intercept form is y = - (1/2)x + 6.

What is slope?

The slope is the rate of change of the y-axis with respect to the x-axis.

The equation of a line in slope-intercept form is y = mx + b, where

slope = m and y-intercept = b.

We know the greater the absolute value of a slope is the more steeper is its graph or the rate of change is large.

The equation of the given line is x + 2y = 6.

We know equation of a line in slope intercept form is,

y = mx + b.

Therefore,

x + 2y = 6.

2y = - x + 6.

y = - (1/2)x + 6.

learn more about linesand slopes here :

brainly.com/question/16180119

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Answer:

y= -1/2x+3

Step-by-step explanation:

Sidney bought two magazines that were each $5. If Sidney paid a total of $10.70 for the two magazines with tax,what percent tax did she pay for her purchase?

Answers

10 x 1.07 = $10.70
therefore, she paid 7% tax for her purchase.

Answer:

7% tax

Step-by-step explanation:

[1,07][10] = 10,7

An extra 7¢ were added to that, therefore her tax percentage was 7%.

I am joyous to assist you anytime.

If f(x) = 8 - 5x, find f(3) *

Answers

Answer:

Step-by-step explanation:

f(3)= 8-5(3)

=8-15

=-7

Hey, can someone explain to me how to subtract 85.23 and 2.675!?

Answers

Answer:

Your answer is 85.555,hope this helped or 85.5 with - over it

Step-by-step explanation:

when you line of the decimal its is easier

Helpppppp meeeee .......

Answers

Answer:

.......

B is the answer ......
It seems like the same perimeter ，or u can measure it with a ruler!

Here is a picture of a math problem.

Answers

is true the answer is 60%
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