How Did the Equation Change to y = x + 30?

[nukeman]

**Quick: Just a SIMPLE question on Linear equation.

Homework Statement

Ok,

5x + 2(30) = y

turns into:

5/3x + 20 = y (that is 5 over 3 x)

Now it says something I don't understand.

"We now have two equations:

y = 5/3x + 20 and y = x + 30 (How did it get y = x + 30?)

Homework Equations

The Attempt at a Solution

Thanks, appreciate it!

 

[rock.freak667]

Homework Statement

Ok,

5x + 2(30) = y

turns into:

5/3x + 20 = y (that is 5 over 3 x)

I don't understand this, your book went from a linear line to a non-linear line?

 

[HallsofIvy]

Homework Statement

Ok,

5x + 2(30) = y

turns into:

5/3x + 20 = y (that is 5 over 3 x)

Perhaps you mean (5/3)x+ 20= y but even that is wrong. Dividing 5x+ 2(30)= y through by 3 gives (5/3)x+ 20= (1/3)y.

Now it says something I don't understand.

"We now have two equations:

y = 5/3x + 20 and y = x + 30 (How did it get y = x + 30?)

Presumably y= x +30 is given by some other condition before what you have quoted.

Homework Equations

The Attempt at a Solution

Thanks, appreciate it!