Some Algebra Review By: Mrs. Brown

Functions and Relations Which relation is NOT a function?

Functions and Relations (Continued) Which relation is NOT a function? C is not a function.

Linear Equations,Tables/Equations Which equation matches the coordinates given in the table below? A.y = 2x B.y = 3x C.y = x+4 D.y = x+6 When looking at the table you should notice that y is always three times as large as x, so: Y= 3x To solve: Write the original equation, substitute 2 for x and 6 for y. Simplify. Try at least two of the coordinates to see if the ordered pair is a solution. B. y = 3x

x- and y- Intercepts Which set of ordered pairs represents the x- intercept and y-intercept of the graph of y = 2x – 12? A.(6,0) and (0,12) B.(6,0) and (0,-12) C.(-6,0) and (0,12) D.(-6,0) and (0,-12) Equation: y= 2x - 12 Substitute each coordinate until you find true Solutions for each. (x,y) (0,-12) (6,0) y = 2x = 2(6) = 2(0) = = = = -12 B. (6,0) and (0,-12)

Slope What is the slope of the line that contains points (-3,-5) and (2,7)? A.-2 B.- ½ C.5/12 D.12/5 Slope: The ratio of the vertical rise to the horizontal run. Slope = rise/run D. 12/5

Linear Equations - Graphs  Which of the following graphs represents the equation: Hint: Substitute coordinates into the equation to see if the solution is true. Try at least two pairs on each graph!

Linear Equations - Graphs (0,-4) -4 = 3/2(0) -4 ≠ 0 False

Linear Equations - Graphs (-4,-2) -2 = 3/2(-4) = ≠-10 False

Linear Equations - Graphs (-4,-2) -2 = 3/2(-4) = ≠-10 False

Linear Equations - Graphs (4,2) 2 = 3/2(4) = = 2 True D. Correct answer