Let us solve the following pairs of equations by drawing graphs which are solvable and write 3 solutions which have infinite number of solutions.
p – q = 3
p – q = 3 q = p - 3 ... equation (i)
Equation (i) will be plotted as line AB.
2p – 3q = 36 q = 
... equation (ii)
Equation (ii) will be plotted as line CD.
Here in the graph, we can see that two lines are intersecting each other at point P(--27,-30). Hence it is solvable and its solution is x = -27 and y = -30
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