Generally, the derivative to a linear equation (in the form "ax + b") is the constant that is being multiplied by x (in "ax + b", this would be "a"). This is because a derivative gives the slope of a function, and the slope of a linear function is the coefficient next to x. So, in this case, (7x)' = 7.
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3
14x
21 X squared over 5
y=7x+1 is a linear equation with a slope of 7 and y-intercept at (0,1). It contains two variables, y and x and cannot be solved unless one variable is given. The x-intercept to this equation is (-1/7,0). The first derivative of the equation would be y=7, a horizontal line with y-intercept (0,7). The second derivative and jerk cannot be taken.
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