At the y-intercept, x=0 .
-2y = 18
y = -9
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4x + 2y = 6
If you mean: 2y = -4x-12 then y = -2x-6 and -6 is the y intercept
The y-intercept of a linear equation is the point on the y-axis at which the line cuts.It could be found by plugging x = 0 in the given linear equation.For example,Consider 3x + 2y = 6. To find the y-intercept just plug x = 0 in the equation.3(0) + 2y = 62y = 6y = 3(0, 3) is the y-intercept of the linear equation 2x + 3y = 6.Note:In the same way we can find the x-intercept by plugging y = 0 in the given linear equation.
3x + 2y = 8 This is an equation. It could be the equation of a line.