12 less than 4 times a number is at least 3 more than the number

4x-12>= x+3 that's greater than or equal to. solve for x

Write out the equation
12-4x=3+x

Solve for x by passing all x terms to the left and all non x terms to the right

-4x-x=3-12
-5x=-9

Divide both sides by -5 to isolate x
x=-9/-5

Do the divison in the calculator and get:
x=1.8

Or leave it in fraction form (signs go positive since both were negative)
x=9/5

Where m is the slope of the line and b is the y-intercept of the line, or the y-coordinate of the point at which the line crosses the y-axis. to write an equation in slope-intercept form, given a graph of that equation, pick two points on the line and use them to find the slope. this is the value of m in the equation.