SAT Math

When should you use regressions

When you need to find a variable or when something can be rewritten as

How do you find range

Biggest number - smallest number

What should you do if your table can be rewritten as something

Do y~by what the table can be rewritten as

What is one key tip for using the slider

When you slide the variable it should always be on the line

When there’s only one point of intersection between a quadratic and horizontal line how do I find that point

Find the vertex(minimum or maximum)

how do I solve equations

Make the left side equal to y

Make the right side past the = equal to y

How do I solve systems of equations

Plug numbers in and look for intersect

How do I find intercepts

Write the equation down and see where the line crosses what intercept you’re looking for

What should you do if it says the product of the solutions

Multiple the solutions together

When you see constants what should you do

Use regression

If it’s asking for the maximum/minimum but isn’t asking for the x value what value should you put in

Y value

How do find the slope of a perpendicular line

Flip the slope of the first line and change the sign

What do points of intersection mean

How many solutions

When having two equations with one equal sign what should you do

Split the sides

In a function like f(x) what does the number in the parentheses tell you

What the value of x is

How do I evaluate functions

Type the problem in and type in the value of x

What is the standard form for a quadratic function

Y=ax2 +bx+c

What is the vertex form for a quadratic function

Y=a(x-h)2+k

What is the factored/intercept form for a quadratic function

Y=a(x-r1)(x-r2)

For function translations how do you know what moves f(x+6)-3

The number inside the parenthesis tells you if it goes right or left and the the number outside tells you up or down

when does desmos not work for solving equations

When it has absolute values and rational expressions

Percent multipliers

Increase=(1+%/100)

Decrease=(1-%/100)

Original x Percent multiplier=final

Percent change from PM

(Percent multiplier-1) x 100

Percent change formula

\frac{new-old}{old}\cdot100

What is the linear automatic regression formula

Y=mx+b

What is the quadratic automatic regression formula

y=ax^2+bx+c

What is the exponential automatic regression formula

y=a\times b^{x}