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The slope of a linear function is also a measure of how fast the function is increasing or decreasing. The only difference is that the slope of a straight line remains the same throughout the domain of the line.
No, it would have to be parallel to the y-axis, making the slope undefined and having only a single x-value. Not a linear function.
y=mx+c where y is the output and m is the slope
looking they can't of got far
Direct variation means that a linear function can be written as y = kx. The y-intercept must be (0, 0). The constant, k, is the slope.