Question

For the line y = 2/5x, if the y-coordinate is 20, what is the x-coordinate? A. 5/2 B. 50 C. 125 D. 8

Answer 1

Ok here is how you do this:
you need to replace y with 20 and then solve to find x, i.e. solve this equation
20=2/5x

1. Simplify 2/5x to 2x/5
   20=2x/5

2. Multiply both sides by 5
    20 * 5=2x

3. Simplify 20 * 5 to 100
    100=2x

4. Divide both sides by 2
   100/2=x

5. Simplify 100/2 to 50
     50=x

6. Switch sides
     x=50
so your answer is B. 50
I hope this helped!

Answer 2

Replace y with 20 and the solve to find x, i.e. solve this equation:\[20=\frac{2}{5}x\]