• # Unit 4

combining like terms- a mathematical process used to simplify an expression to add or subtract polynomials
constant term- doesn't change when x changes; i.e., 5x-8; 5x+2

system of equations- a set of equations where you want to find a solution that makes all the equations true at the same time; i.e., x+y=5; 2x-y=-2; solution: (1,4)

# Unit 3

linear relationship- a relationship between two quantities that graphs a line
slope- rate of change; constant rate;

vertical

horizontal

solution to an equation with two variables- any ordered pair (x,y) that can be used in place of the variables to make the equation true
vertical intercept- the point where the graphed line crosses the vertical axis; "y-intercept"

# Unit 2

center (of dilation) - (lesson 3) The point (center) from which a dilation occurs.
dilation - (lesson 2) A dilation occurs when a figure changes size but not shape (shrinks or enlarges) by a scale factor. A dilation must have a center from which the dilation occurs.

scale factor - (lesson 1) The scale factor is the multiplier used to dilate a figure.
similar - (lesson 6) On figure is similar to another if there is a sequence of rigid transformations and dilations that moves the ifrst figure so that it fits exactly over the second.
slope - (lesson 10) The slope of a line is the quotient of the the vertical distance and the horizontal distance between any two points on the line.