C3 Equations and Inequalities

Question 1

How can we use algebra to find out how many points of intersection there would be?

Answer 1

Sub linear into quad

Then with new equation use the discriminant to find out the types of roots it has

Question 2

In set notation what does an open mean

Answer 2

Not equal too

Question 3

In set notation what does a shaded dot mean

Answer 3

Equal too

Question 4

What should you do when asked to find the x values of two equations using set notations.

Answer 4

Aline two on a graph and find the section where they overlap

Question 5

What are the two formats of writing set notations?

Answer 5

{XER:nn}

Question 6

Find the value of 6/x > 2

Where x does not equal zero

Answer 6

Not sure if x is negative or positive so can’t just multiply each side by x (don’t know if the inequality will flip or not). But by x squared instead.

Question 7

What’s the quickest way to find out the values of x and y with a linear equations like 2y+x<14

Answer 7

Find x when y is equal to 0
Find y when x is equal to 0
(Cover up method)