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The y-intercept is where the x-coordinate is zero. Substitute 0 for x in the equation to find the y-coordinate of the y-intercept:
y = -3x - 9
→ y = -3 × 0 - 9
→ y = -9
→ The y-intercept has the ordered pair (0, -9).
Graph of an equation.
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In general you cannot. Any set of ordered pairs can be a graph, a table, a diagram or relation. Any set of ordered pairs that is one-to-one or many-to-one can be an equation, function.
You find the equation of a graph by finding an equation with a graph.
you create ordered pairs or a serious of (x,y) points on the graph which you can plot and connect with a straight line