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What is the (y)-intercept of the line (5x-3y=15)?

Answer and explanation

Correct answer: ( (0,-5) )

The y-intercept is the point where a line crosses the y-axis. Every point on the y-axis has \\(x=0\\). Substitute this value into \\(5x-3y=15\\): \\(5(0)-3y=15\\), so \\(-3y=15\\). Dividing by \\(-3\\) gives \\(y=-5\\). Therefore the y-intercept is \\((0,-5)\\), which is option B. The point \\((3,0)\\) is the x-intercept instead, since it is found by setting y equal to zero.

The result can also be checked by putting \\((0,-5)\\) into the equation: \\(5(0)-3(-5)=15\\), so the equation is satisfied. Because the y-coordinate is negative, the point lies five units below the origin on the y-axis. A positive point \\((0,5)\\) would give \\(-15\\), not 15, so it cannot be correct. Hence the supplied answer B is fully supported.

Related tags

Y InterceptNegative InterceptGraph

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