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Why do you replace y or x with zero in equations that you use x and y intercepts?
Wiki User
∙ 12y ago
Because, in order for the equation to cross the x-axis (for example), the y-value must logically be zero. Otherwise the point that you find would not be along the x-axis; e.g if y=1, the point would be above the x-axis, or if y=-2, the point would be below the x-axis, rather than the intercept on the x-axis.
I.e to plot co-ordinates, you always plot x (across), the y (up or down). To find the x intercept, you need to know how much "across" it is, but you don't want it to be "up or down", since then it won't be the intercept. This is why 'y' must be zero.
The argument is the same for plotting y-axis intercepts.
Wiki User
∙ 12y ago
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Find the x-intercepts for the parabola defined as y equals -9 x to the second power-6x plus 9 answer as two ordered pairs?
The x intercepts are when y=0. Substitute the zero in for all y and then solve. Use quadratic formula and reduce. I got (-1+/- sqrt 10)3 about .72075922 and -1.387425887
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What do you do when you have two equations mutiply or divide?
To solve two simultaneous equations - usually two equations with the same two variables each - you can use a variety of techniques. Sometimes you can multiply one of the two equations by a constant, then add the two equations together, to get a resulting equation that has only one variable. Sometimes you can solve one of the equations for one variable, and replace this variable in the other equation. Once again, this should give you one equation with a single variable to be useful.
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