Question 229286
graph 

30x+50y-100=0  or 30x+50y=100
3x-15y-30=0  or 3x-15y=30


Step 1.  The graph of the two lines are shown below:


{{{graph(400,400, -10, 10, -10, 10, -3x/5+2, x/5-2)}}}


Step 2.  The intersection point is (-1,5) or x=-1 and y=5


Step 3.  As a check, solve using substitution


*[invoke linear_substitution "x", "y", 30, 50, 100, 3, -15, 30 ]


which yields the same result with x=5 and y=-1.


I hope the above steps were helpful.


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Respectfully,
Dr J

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