graph the linear equation by solving for y first x+5y=20

Question

anonymous · Answer

get y by itself

anonymous · Answer

Okay to solve for y

x+5y=20 subtract x on both sides
 -x     -x
____________
   5y= -x+20  divide 5  on both sides
    
   5y/5= (-x+20)/ 5
  y= -x/5+4

anonymous · Answer

4 is your y intercept so you will plot 4 on the graph

anonymous · Answer

Next you have -x/5

All the this (-x/5) says is that you go down 1 and over 5, do you understand??

anonymous · Answer

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anonymous · Answer

That was correct (and nicely explained!) until the last step.  The graph of y = -x/5 + 4 doesn't intersect the x-axis at (5,0)...  

when y = 0, the equation is 0 = -x/5 + 4
so x/5 = 4    making x = 20 for y = 0.

The graph goes down 1 unit for every 5 it moves to the right.  So to move down from the y-intercept of (0,4) to the x-axis, it has to drop 4 units down... so it moves 4(5) = 20 units to the right.

anonymous · Answer

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