if you are looking at a graph the y intercept is when the graph crosses the y axis and the x intercept is when the graph crosses the x axis.if you have a formula... plug zero in for x to find the y...
To find the x intercept of an equation, simply plug in 0 for the y value, and solve for x (at the point where the line crosses the x axis, y will be equal to 0).
Ex/
2y + 3x = 21
3x = -2y + 21...
x and y can be used to determine many things. For math, for instance, they are used for variables as to isolate the variable term and variables in expressions and equations. The x any y in math can...