maths
posted by Rox .
The lines x=4y−a and y=4x−b intersect at the point (1,2). What is a+b?

X = 4ya = 1
4*2  a = 1
a = 7.
Y = 4x  b = 2
4*1  b = 2
b = 2.
a + b = 7 + 2 = 9.
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