Question 355856
Hi,
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*Note: these lines are perpendiular to one another:
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y = a is perpendicular to the y-axis at point (0, a)
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x = b is  is perpendicular to the x-axis at point (b, 0)
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The lines will cross at Pt(b,a) and Pt(b,a) will be the solution for the system.
The system is consistent as Pt(b,a) is consistent with both lines.
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The example below would be y = 5 and x = 4.  these lines having Pt(4,5) in common

{{{drawing(300,300,-10,10,-10,10,blue(line(4,10,4,-10)),grid(1),graph(300,300,-10,10,-10,10, 5))}}}