No, only equations that can be modeled as straight lines can appear in this form. For example, population growth would need at least an exponential graph i.e. y = ex and could not be even slightly modeled by the equation y = mx+b
A quadratic equation.
2
Solving the equation for "y" gives you the slope-intercept form.
9
It is the general form of a quadratic equation.
x = 4.5
The equation contains variables which are only raised to the first power.
No, not if the y is squared. When graphed the equation will not form a straight line.
x + y = 3
There are no "following" data!
It is a straight line equation that can be simplified to: y = 3x-9
It is slope intercept form. The equation for slope intercept form is y=mx+b which is like your equation y=5x+6