The lines x = 4y - a and y = 4x - b intersect at the point (1,2). What is a + b?
x = 4y - a
y = 4x + b
And we know that
1 = 4(2) - a
2 = 4(1) - b simplify
1 = 8 - a
2 = 4 - b
a = 7
b = 2
a + b = 9
