Question

Write the equation 5x + 4y = 10 so that y is a function of x.
Show your work.
A. y= 5/4x + 2.5
B. y= 1.2x - 5/2
C. y= -5/4 - 5/2
D. y= -5/4x + 5/2

Answer 1

  5x + 4y = 10
- 5x          - 5x
          4y = -5x + 10
           4           4
            y = -1¹/₄x + 2¹/₂

The answer is D.

Answer 2

The general equation of the slope intercept form is y = mx + b. The first step is to subtract the whole equation by 5x. This leaves 4y on the left side. Then, divide the whole equation by 4, which results to option D. y= -5/4x + 5/2