1) What is the domain in math? a) The domain is the set of x values that makes the functions expression valid. b) The domain is the set of y values that makes the functions expression valid. 2) What is the range in math? a) The range is the set of x values that makes the functions expression valid. b) The range is the set of y values that makes the functions expression valid. 3) What is a function? a) A function is a relation between the set of inputs(x-variable) having one output(Y-variable) each. Any repeated inputs means the expression is not a function. b) A function is the function for making an expression valid 4) Is this a function? a) no, because 2 is repeated two times, which is not allowed. b) yes, because it portrays a correct expression. c) No, because it is a table 5) The sum of two consecutive odd numbers is 148. find the numbers. a) The two consecutive odd numbers are 73 and 75, because x + (x+2) = 148, 2x + 2=148 use subtraction property, 2x=146 use division property, x=73, 73+2=75, x=75. b) The two consecutive number are 144 and 146 c) The two consecutive odd numbers are 140 and 142 d) 139 and 141 6) -9(x-5)+9 greater than 3x + 42, find interval notation. a) Yes it has infinite solution because the final answer of the two inequalities is x is greater than 1, and the interval notation (1, infinite) b) Interval notation is (-1, infinite) c) Interval notation is [1, infinite) d) Interval notation is [-1, infinite) 7) What is a linear equation? a) A linear equation is the relationship between the x and y on a graph to form a straight line on the graph. b) A linear equation is the relationship between high frequency graph vs low. 8) What is the standard form in math? a) Ax + By = c b) y=mx+b (m is slope) (b is y intercept) 9) What is the slope intercept form? a) y=mx+b (m is slope) (b is y intercept) b) m=y2-y1/x2-x1 10) What is the slope form? a) m=y2-y1/x2-x1 b) y=mx+b 11) Identify the slope and y-intercept of the equation 2x + 5y = 20 a) The slope is -2/5x and the y-intercept is 4, because move 2x to the left and its -2x, 5y=-2x+20, divide by 5y on both sides and you get y= -2/5x + 4 b) The slope is 2/5x 12) Write a linear equation with a slope of 1 and a y-intercept of -7 a) y = x - 7 b) y = x + 7 13) (-4-1) and (-3-12) a) m = -1/3, because -4-1 and -3-12 is same as -4+1 and -3+12, so m = -1/3 b) m = 1/3 14) Write an equation that is parallel to y = -4x + 5 and passes through the point (-2, -1) a) y = -4x - 9, because use the point slope   formula which is y1 - y = m(x-x1),  so y + 1= -4x + 8, subtract by 1 and you get y = -4x - 9. b) y = 4x + 9

Math grade 9

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