Alllllllllgggeeeeebraaa?

Question:can someone explain how to get answers for there problems?

whats the x-intercept for the line y= -5x-9?

find all solutions to the equation l7x+4l =18

factor the polynomial x^2-5x-36

and solving x^2-9x=36

Answers:
y= -5x - 9
*substitute 0 for y when looking for the x intercept, and substitute in 0 for x when looking for the y intercept.*

y= -5x - 9
(0) = -5x - 9
(0 + 9) (+ 9 )
9= -5x
9/ -5 = -5/-5
-1.8 = x

x = -1.8





*FIND ALL SOLUTIONS TO THE EQUATION |7x + 4| = 18 *

|7x + 4| =18

7x + 4 = 18 7x + 4 = -18
(-4) (-4) (-4) (-4)
7x = 14 7x = -22
7x /7 14/7 7x/7 -22/7
x = 2 x = 3.1428571 (repeat sign on the last digits, i dont know where it is on the keyboard)




* THE OTHER ONES, YOUR SCREWED. *
* HOPE THIS HELPED! if i did...GIMME BEST ANSWER!*
wow..lotsa questions..
anyway:let's try:
x- intercept- meaning the point in the line where the y = 0
so making y = 0
y = -5x - 9
0 = -5x - 9
5x = -9
x= -9/5---> answer x intercepet

|7x + 4| = 18
remember |n| = n, -n
so trying -n
-7x - 4 = 18
x = - 22/7--> ist ans

trying n
7x + 4 = 18
7x = 14
x = 2 ---> 2nd ans


next:
x^2 - 5x - 36
try to get the perfect square, you will get:
(x - 9) (x + 5) -- answer

last:
x^2 - 9x = 36
factoring out: you get
(x -12)(x + 3)
so:
x = -3, x = 12 ---answers

hope this helps

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