9th grade math????????

Question

I'm in 8th grade and I take advanced math, I missed a few days of school last week and I don't understand these new equasion things, can anyone try to explain it to me. I need to solve the equasion to find #x, # by itself and #y. Then I have to graph it.
Slope= # in front of x
y intercept= # by itself
Here's one of the problems:

x+y<3

Answer 1

let me at least solve ur example q.s

given: x+y<3

Step 1: take the eq. x+y=3
y=3-x
if x =3, y = 0. so one ordered pair is (3,0)
similarly, we get other like (1,2), (2,1), (0,3) and so on

mark these points on a cartesian plane and join them 2 get a line

Step 2: now, the actual ineq is x+y<3
u see that the line divides the plane into 2 parts? on either side of d line (note: a line can be extended infinitely)
take a pt. on one side of d line. find its (x,y) value. substitute.does it satisfy the inequation? if yes, then all points that side of d line are the graph of d line. if not, its the other side (check it d same way)

NOTE: u gave me that x+y is lesser than 3, not lesser than or equal to
hence, the graph of d inequation does not include the line itself. that's imp

any other doubts? mail me

Answer 2

y<-x+3 and then just plug into the graphing calculator. or just graph -x+3 with dashed lines then shade to left of the line.