SOLUTION: Im totaly lost on my 8th grade math homework. It says *For each equations in Exercises 18-21, give two values for x for which the value of y is negative.* For 18. y=-2x-5 19. y=

Click here to see ALL problems on Graphs

Question 209958This question is from textbook Moving straight ahead Linear RelationShips
: Im totaly lost on my 8th grade math homework. It says *For each equations in Exercises 18-21, give two values for x for which the value of y is negative.*
For 18. y=-2x-5
19. y= -4
20. y=2x-5
21. y=3/2x-1/4 This question is from textbook Moving straight ahead Linear RelationShips

Found 2 solutions by stanbon, vleith:
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
Im totaly lost on my 8th grade math homework. It says *For each equations in Exercises 18-21, give two values for x for which the value of y is negative.*
For
18. y=-2x-5
If x = 0, y = -2*0-5 = 0-5 = -5
If x = 1, y = -2*1-5 = -2-5 = -7
-----------------------------------------
19. y= -4
If x = 0,y = -4
If x = 1, y = -4
---------------------------
20. y=2x-5
If x = 0, y = 2*0-5 = -5
If x = 1, y = 2*1-5 = -3
-------------------------------
21. y=(3/2)x-(1/4)
If x = 0, y = (3/2)*0 -(1/4) = -1/4
If x = -1, y = (3/2)*-1-(1/4) = (-6/4)-(1/4) = -7/4
=======================================================
Cheers,
Stan H.

Answer by vleith(2983) (Show Source):
You can put this solution on YOUR website!
18)
for y to be negative here, any x that is positive will do. Even x=0 would make y negative

You could solve it algebraically this way. In order for y to be negative, it must be "less than 0"

so any x that is larger than -2.5 will give you a y that is negative. Look at the plot and you can see the same thing

19) y= -4
This is a horizontal line. So all x, no matter what value has a y = -4

20)

In this much like 18.

Any x less than 2.5 yields a y that is negative

21)

Same idea here

Any x less than 1/6 works