I think I am way off :
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to substitute given equations you express one value in terms of the other eg x in terms of y and the use it in the other equation
Move the ys to the other side
What would be the plots?
you can draw the line which passes through
15,3 then you plug in values like the value of x when y is 0 for both equations and the value of y when x =0
The lines should cross one another at 15,3.
You can take any values on x which are near 15 then plug them in the equation of each line and plot..
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