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Graphs!WEEK 3–JULY 22, 2018BRANDY CHAMPION
Determining X & Y Intercepts!•The intercepts of a graphare the points at whichthe graph crosses the axes –ALWAYS equal ZERO! •The x-intercept is the point atwhich the graph crosses the x-axis•The y-coordinate is zero; ( x, 0 ) •The y-intercept is the point at which the graph crosses the y-axis•The x-coordinate is zero; ( 0, y )y-interceptx-intercept
Determining X & Y Intercepts!•To determine the y-intercept, set x = 0 and solve for y.•y = 5(0) + 2•Solve!•y = 2•y-intercept is ( 0, 2 )•To determine the x-intercept, set y = 0 and solve for x.•0 = 5x + 2•Subtract 2: •-2 = 5x OR 5x = -2•Divide by 5 on both sides:•x = -2/5•x-intercept is ( -2/5, 0 )Example: y = 5x + 2Confirm by graphing the equation!
Graphing Equations Using a Data Table or x & y-intercepts!•y = 5x + 2•Only need TWO points to graph a linear equation!•To create the table: Make a list of x values and solve for y. x-2-1012yx-2-1012y-8-32712