<PRE><B>Question 838687</B>
A linear system is given.

y= 1/5x - 3   line 1
y= -2/7x +1   line 2

a) Explain why the following is an equivalent linear system.
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y= 1/5x - 3   line 1
Multiply by 5
5y = x - 15
Subtract 5y
0 = x - 5y - 15
Add 15
x - 5y = 15  which is line 3 below.
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Line 2 is the same as line 4.
   
   x-5y=15    line 3
   2x+7y=7    line 4

b) If you graph all four lines, what results do you expect? Graph to check. 
You get the same 2 lines twice.</PRE>