Question

find an equation of the line that satisfies the given conditions
a) standard form
b) slope intercept form

x intercept is (9,0) and slope: 8

Answer 1

@math&ing001 @SnuggieLad @ONYXxELITE

Answer 2

Do you know the equation for the standard form of a line?

Answer 3

Please find and copy down here the "standard form" and the "slope-intercept" form of the equation of a straight line. You need to know what you're looking for in this problem.

Answer 4

standard form is Ax+By=C and slope intercept is y=mx+b

Answer 5

i found that the slop intercept for the above equation is y=9x+8 am i right?

Answer 6

No that equation is incorrect.

Answer 7

how is it supposed to be?

Answer 8

First you must find the b value by plugging in the coordinate it gives you.
y = mx + b
We know the slope is 8
y = 8x + b
Plug in the coordinate it gave you.
0 = 8(9) + b
0 = 72 + b
b = -72
y = 8x - 72

Answer 9

@xGuardians did u read wat the question wants?

Answer 10

Yes. I just gave you the answer to the point-slope equation (b).

Answer 11

Your goal: Find the line such that "x intercept is (9,0) and slope: 8" This means that when x=8, y=0. xGuardians' work is correct; what makes you think he didn't read the instructions?

Answer 12

and in standard form?

Answer 13

Take the equation arrived at by xGuardians and convert it into standard form. You correctly identified the appearance of "standard form."

Answer 14

In other words, convert y = 8x - 72 into standard form Ax+By=C.

Answer 15

wouldnt it be 8x-72+9

Answer 16

No, because this expression of yours has no = sign.

As you yourself have stated, standard form looks like Ax+By=C. Where's your = sign?

Answer 17

and what happened to the variable y?

Answer 18

i dont know

Answer 19

Back to the drawing board: y = 8x - 72

Note that this includes a = sign.

We want both x and y to be on the same side of your equation. Please subtract 8x from both sides of y = 8x - 72.

Answer 20

i get -80?

Answer 21

I don't see how you'd get -80.

Please note that you're working with an equation y = 8x - 72

x and y are NOT going to disappear. Basically you're just rearranging these 3 terms.

If y = 8x - 72

please subtract 8x from both sides. Note that -72-8x is not -80; one term (-72) is just a number, whereas the other term (-8x) contains the variable x.

Answer 22

how do i do that?

Answer 23

Subtract 8x from both sides of your equation:

y = 8x - 72
-8x = -8x
------------------


Finish this, please.

Answer 24

Please do not move on to a new problem without finishing the current one. You are not finished with this problem. It is essential that you understand what "subtract 8x from both sides" means and how to do it.

Answer 25

oh ok y=x-72?

Answer 26

Subtract 8x from both sides of y = 8x - 72. No, it is not y=x-72.

Answer 27

y = 8x - 72
-8x = -8x
--------------------- Finish this, please.

Answer 28

-8x+y=72?

Answer 29

@mathmale

Answer 30

Correct, except for the sign of 72. Why do you believe the sign of 72 is positive when it started out as negative?

Answer 31

because as we have subtracted -8x the sign immediately changed