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### 7 Cards in this Set

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 Methods to solve the two linear independent equations? 1. Multiplication: to multiply two equations by the same number 2. Substitution: to substitute one variable to another equation Interprete linear equation as a graph: y = a + bx y - the dependent variable which varies with the x value a - y-intercept which will cut the y axis given x = 0 b - coefficient or slope which refer to how the y value changes when one unit of x changes x - independent variable which will change the y-value How the linear equation apply to the costing? y = a + bx In terms of cost: y = total costs a = fixed costs which is positive although production units are zero b = the change in total costs when one unit of x change x = no. of units produced How to determine the slope of linear equation slope = change in y / change in x (to determine how much y will change for one unit of x change) What is the positive and negative slope mean? Positive slope will go upward as x goes up, y will go up too Negative slope will go downward as x goes up, y will go down. what is the slope for horizontal line? As x change, y is constant; so slope = (y2 -y1) / (x2 - x1) = 0 / 1 = 0 what is the slope of vertical line? as x is constant, y is changed; so (y2 -y1) / (x2 - x1) = 1/0 = infinity or the steepest slope.