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

 Jan 26, 2021
 #1
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We know that (1,2)  is on each line  ....so....

 

1  = 4(2)  + a

2 =  4(1)  +  b             

 

1  =  8 + a

2 = 4  +  b

 

add these

 

3  = 12  + a +b

 

3 - 12 =   a + b

 

-9  = a + b 

 

 

cool cool cool

 Jan 26, 2021

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