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The lines x = 4y - a and y = 4x - b intersect at the point (1,2).  What is a + b?

 Jan 1, 2020
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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

 

 

cool cool cool

 Jan 1, 2020

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