Ch.3 Equations & inequalities Flashcards
1
Q
how can linear simultaneous equations be solved?
A
either elimination or substitution
2
Q
what is the solution of an inequality?
A
the set of real numbers that make the inequality true
3
Q
using set notations how would you write when x is greater than 2.75?
A
{x:x>2.75}
4
Q
in set notation what are the two ways that x > -2 and x < 4?
A
{x: -2 < x < 4}
{x: x > -2} ∩ {x: x < 4}
5
Q
in set notation how would you write if x < -1 or x > 3?
A
{x: x < -1} ∪ {x: x > 3}
6
Q
if two sets of values overlap ( intersect ) where -2 < x < 6.5 how would you write it in set notation?
A
{x: -2 < x < 6.5}
7
Q
if there is no overlap between the two sets of values when x < 2 and x > 3 how would you write it in set notation?
A
{x: x < 2} ∪ {x: x > 3}