# Math Help - [SOLVED] Could someone tell me if my answers are correct please?

1. ## [SOLVED] Could someone tell me if my answers are correct please?

Find the slope and y-intercept of the following.

y=3x-5

slope=3, y-intercept=-5

----------
Write an equation for the line with slope 1/3 and y-intercept 4.

y=1/3x+4

Write an equation for the line with slope 3 going through point (1,-2).

y=3x+(-2)

I also need help getting the formula to solve a question:
(I have already arrived at an answer, but I used logic and not a formula to get to it)

One eighth of the square root of 7 less than a number is 2 what is the number?

263

I got to that answer by saying that if 2 was one eighth the square root of the number, minus seven, then 16=the square root and since 16^2=256 then the number must be 256+7=263

Thank you again for your help!
Drakmord

2. Originally Posted by drakmord

Write an equation for the line with slope 3 going through point (1,-2).

y=3x+(-2)
You can use the formula $y-y_1=m(x-x_2)$

So you have:

$y-(-2)=3(x-1)$

$y+2=3x-3$

$y=3x-5$

3. Originally Posted by drakmord
I also need help getting the formula to solve a question:
(I have already arrived at an answer, but I used logic and not a formula to get to it)

One eighth of the square root of 7 less than a number is 2 what is the number?
$\frac{1}{8}\times\sqrt{x-7}=2$

$\sqrt{x-7}=16$

$x-7=256$

$x=263$