Question

y=-2x+8 x=4 solve this, answer should be -2

Answer 1

@ganeshie8 @HelpBlahBlahBlah @sleepyjess @sleepyhead314 @bohotness @YOLO_KING HELP please

Answer 2

y=2x and y=-2x + 8
Both equations are in the format of...
y=mx+b
m is the slope.
b is the y-intercept, the value of y when x=0.
y=2x+0
slope is 2.
y-intercept is 0, corresponding to the point of (0,0).
Slope is change-of-y divided by change-of-x, also known as rise-over-run. For this equation, you will begin with the provided point and move the line such that it rises 2 units, while running 1 unit to the right. It will also descend 2 units, while running 1 unit to the left.
y=-2x + 8
slope is -2.
y-intercept is 8, (0,8).
For this equation, you will begin with the provided point and move the line such that it rises 2 units, while running 1 unit to the left. It will also descend 2 units, while running 1 unit to the right.
You can check your work by verifying that the two lines met at the correct coordinate...
y=2x and y=-2x + 8
2x=-2x + 8
Let's add 2x to both sides of the equation...
2x+2x=2x-2x+8
4x=8
Divide both sides by 4...
(4x)/4=8/4
x=2
Plug this into one equation to establish the value of y. The first equation is easiest...
y=2x
y=(2)(2)
y=4
Plug both results into the other equation to verify...
y=-2x + 8
4=[(-2)(2)]+8
4=-4+8
4=4
The two lines will meet at (2,4).

Answer 3

Just substitute 4 for x

Answer 4

Ummmmm..... what is all that @bohotness

Answer 5

Are we solving for X because I got no algebraic solution.

Answer 6

Is it a system of equations? Or do you have to plug in the variable?

Answer 7

look how i did it.....y=-2(4)+8=0 ,x=4 so ,0/4 answer is acc. to my solution

Answer 8

okay

Answer 9

but it's wrong....?

Answer 10

Ok so you have to plug in the variable?

Answer 11

here are 8 units rise and 4 units run and y=-2x+8 ...so how we will solve this @sleepyjess @bohotness

Answer 12

y = 2x
y = -2x + 8

y = 2x is a line through the origin with slope 2.

y = -2x + 8 = -2(x - 4) is a line through (4,0) with slope -2.

Since the lines have opposite slopes they, along with the x-axis, will form an isosceles triangle having a vertex at x = (0+4)/2 = 2.

y = 2(2) = 4
y = -2(2)+8 = 4

Solution is (2,4). <_------- does that help

Answer 13

@bohotness where are you getting y = 2x from???

Answer 14

y=-2x+8 x=4 solve this, answer should be -2

Answer 15

Y IS RIGHT THERE

Answer 16

y's origion is ''0'' ,so rise is 8 and run is 4 if we make triangle then 8 to 4 rise over run so we will put the value of y =-2(4)+8=0 and x =4 then -2 is not the answer we getting???

Answer 17

okay