The tax on a property with an assessed value of $53,000 is $700. Using a proportion, find the tax on a property with an assessed value of $87,000.
(Round to two decimal places.)

Okay, the first thing to do here is calculate something known as the "slope".

the slope is represented by "m" in the standard form: y = mx+b
the slope is also known as the rise over the run, y2-y1/x2-x1

substitute those points in: (-8,0) and (1,5) 5-0/) 

= 5/9   the slope is 5/9 

now we have to use the slope, and resubstitute another point to get y-intercept (1,5)

5 = 5/9(1)+b
5-5/9 =b
b=4.444

therefore, the standard equation of the line is {{ y =5/9x+4.4445