equations and inequalities

Question 1

what is the elimination method

Answer 1

making to of the coefficients match up so you can add of divide to eliminate them

Question 2

what is the substitution method

Answer 2

rearrange one of the equation to x equals or y equals so that this can be substituted into the other equation in the place of x or y

Question 3

how can you find the solutions to a pair of simultaneous equations on a graph

Answer 3

the solutions can be represented by the points of intersection

Question 4

when do you use dotted lines for inequalities on a graph

Answer 4

when it is <>

Question 5

when do you use solid lines for inequalities on a graph

Answer 5

when its <> or equal to

Question 6

what happens when you multiply or divide an inequality by a negative number

Answer 6

you need to reverse the sign

Question 7

how do you right set notation

Answer 7

(x:x<n)n/u(x:x>n)

Question 8

how do you solve quadratic inequalities

Answer 8

1- replace <> with = to solve
2-sketch a graph and highlight when the value satisfy inequality
3-write in set notation

Question 9

what do we do with inequalities with a faction with x denominator

Answer 9

we have to multiply by x squared so we eliminate the possibility of x being negative