SAME equations Plz help?

Question

if you want to isolate the y from equation 4x-5y = -20 is this the equation

y = 4x -4 if not tell me what my mistake was

thank you

Answer 1

4x-5y = -20

-5y = -4x-20

5y =  4x+20

y = 4/5x + 4

The equation is a line.  Pick two x-values then calculate the y-values then plot the two points and join them up with a line.

Good luck.

Answer 2

4x - 5y = -20

-5y = -4x -20

y = 4/5x + 4

i'm pretty sure that should be your answer ^^

did you divide -4x by -5??

graphing: 4 would be the y-int. so you would start at +4 on the y-axis. 4/5 woud be the slope (rise over run) meaning from +4 you'd go up 4, right 5 and plot a point. you can also go down 4, left 5.

Answer 3

4x - 5y = - 20

5y = 4x + 20

y = (4x + 20)/5 or y = 4/5x + 4

Answer: y = (4x + 20)/5 or 1/5(4x + 20) or 4/5x + 4. Any from these choices will do.

Answer 4

4x - 5y = -20

-5y = -20 - 4x

5y = 20 + 4x

y = 4 + .8x

Answer 5

-5y = -4x-20

y=4/5x + 4

You are missing a 5 under 4 with the variable x.  See the above.

Graphing is pretty easy too.

4 is a point on the y-axis.

After you spot the 4 on the y-axis, you draw the slope, which is 4/5

Therefore, you go 4 up and 5 right  (Slope= Rise over Run).  So, start the slope from the 4 on the y-axis, then pin-point another point after you move 4/5 from the y-axis point; 4.

When you get the two points, just connect them both with a line.  And that's your graph.

Hope I was of some help to you.

Take care

Good luck!