SOLUTION: Not sure how to put this in an equation form. The sum of Sharon's age an John's age is 70. John is 4 times as old as Sharon. If you let s=Sharon age on the x axis and j=johns

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Question 1043784: Not sure how to put this in an equation form.
The sum of Sharon's age an John's age is 70. John is 4 times as old as Sharon.
If you let s=Sharon age on the x axis and j=johns age on the y axis then the problem can be represented by a system of equations.
I don't really need help with the equations, just with getting the word problem into the equation. Thank you!
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
I just have to end up with +j+=+f%28s%29+
-------------------
Let +j+ = John's present age
Let +s+ = Sharon's present age
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(1) +s+%2B+j+=+70+
(2) +j+=+4s+
-----------------
(1) +j+=+-s+%2B+70+
-----------------
Substitute (2) into (1)
(1) +s+%2B+4s+=+70+
(1) +5s+=+70+
(1) +s+=+14+
and
(2) +j+=+4s+
(2) +j+=+4%2A14+
(2) +j+=+56+
---------------
The solution is ( 14,56 )
The system of equations is:
(1) +j+=+-s+%2B+70+
(2) +j+=+4s+
------------------------
Here is the plot:
+graph%28+400%2C+400%2C+-10%2C+100%2C+-10%2C+100%2C+-x+%2B+70%2C+4x+%29+