If you define a variable, it can have ANY value - so yes, that includes zero.In a specific problem, it may have a specific value; which may be given, or you might need to figure it out.
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y is equal to a constant, so the slope is zero.
The y-intercept means... When does the line cross through the y-axis?This happens when the x-value is zero... so simply just plug in zero for "x"y = 2 * (0) + 10y = 10y-intercept is equal to 10For the x-intercept just make the y-value equal to zero.
Set 'x' equal to zero, and solve the remaining equation for 'y'.
If y = mx + b, then x = (y-b)/m (for m not equal to zero).
Because at the y-intercept ... the place where the line crosses the y-axis ... 'x' is zero. If you take the equation for the line and make 'x' zero, you'll find that [ y = b ]. So that means that 'b' is the y-intercept.