SAT Math
x + x—ANSWER--2x
x ⋅ x—ANSWER--x²
2x + 3x—ANSWER--5x
Add like terms by adding coefficients.
2x · 3x—ANSWER--6x²
Multiply monomials by multiplying the coefficients and multiplying the
variables by adding the exponents.
linear:
slope-intercept form—ANSWER--y = mx + b
m = slope
,b = y-intercept
linear:
Find the equation of a line in slope-intercept form that goes through the
points (18, 120), (23, 150), (26, 168).—ANSWER--y = 6x + 12
Desmos:
Hit the plus sign to add a table. You really only need two points for a line.
Update: Hit the regression button. You don't need to enter the following
regression formula anymore.
// Then use the tilde symbol (~) to relate variables x1 and y1 with constants
m and b in slope-intercept form.
y1 ~ mx1 + b
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law, Copyrighted By Brittie Donald
,Desmos graphs a regression line and calculates the slope (m) and y-
intercept (b).
m=6
b = 12
Algebra:
Calculate the slope (m) using any two points.
m = (150 - 120) / (23 - 18)
m =
m=6
Plug the slope and any point into y = mx + b.
120 = 6(18) + b
120 = 108 + b
12 = b
linear:
standard form—ANSWER--ax + by = c
, How would you prove the following?
slope = -a/b
x-intercept = c/a
y-intercept = c/b
linear:
slope (standard form)—ANSWER---a/b
to find the y-intercept...—ANSWER--let x = 0
solve for y
Since ordered pairs are written as (x, y),
y-intercepts can be written as (0, y-intercept).
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law, Copyrighted By Brittie Donald
x + x—ANSWER--2x
x ⋅ x—ANSWER--x²
2x + 3x—ANSWER--5x
Add like terms by adding coefficients.
2x · 3x—ANSWER--6x²
Multiply monomials by multiplying the coefficients and multiplying the
variables by adding the exponents.
linear:
slope-intercept form—ANSWER--y = mx + b
m = slope
,b = y-intercept
linear:
Find the equation of a line in slope-intercept form that goes through the
points (18, 120), (23, 150), (26, 168).—ANSWER--y = 6x + 12
Desmos:
Hit the plus sign to add a table. You really only need two points for a line.
Update: Hit the regression button. You don't need to enter the following
regression formula anymore.
// Then use the tilde symbol (~) to relate variables x1 and y1 with constants
m and b in slope-intercept form.
y1 ~ mx1 + b
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law, Copyrighted By Brittie Donald
,Desmos graphs a regression line and calculates the slope (m) and y-
intercept (b).
m=6
b = 12
Algebra:
Calculate the slope (m) using any two points.
m = (150 - 120) / (23 - 18)
m =
m=6
Plug the slope and any point into y = mx + b.
120 = 6(18) + b
120 = 108 + b
12 = b
linear:
standard form—ANSWER--ax + by = c
, How would you prove the following?
slope = -a/b
x-intercept = c/a
y-intercept = c/b
linear:
slope (standard form)—ANSWER---a/b
to find the y-intercept...—ANSWER--let x = 0
solve for y
Since ordered pairs are written as (x, y),
y-intercepts can be written as (0, y-intercept).
© 2026 Copyright. All Rights Reserved. This document is
protected by copyright law, Copyrighted By Brittie Donald
