inequalities

[blissful sorrel]

In the solution where does the “a “come from

What does x>a even mean in this context

[hot locust]

forget the a, just a placeholder

the x part could just be

${x \in \mathbb{R} :x \geq 4 }$

[jolly robin]

Josh

[blissful sorrel]

Ah okay

[blissful sorrel]

Also didn’t they use the wrong symbol

Wouldn’t it be a U in this case

@hot locust

[hot locust]

U is 'or'

the notation is correct

as the shaded region is the 'intersection' of the two sets

if it was 'or'

this would be shaded

[blissful sorrel]

Ahhhh

Wait one more thing Josh

How were they able to get the co ordinates (0,7) and (4,15)

@hot locust

[hot locust]

set the equations equal to eachother and solve

[blissful sorrel]

But that gets you to x^2 -4x

[hot locust]

which is x(x-4)

and when solving equal to 0

you get x = 0, x = 4

then re enter the x values to find corresponding y values

leading to those coords