Variable a is 4 more than variable b. Variable a is also 1 less than b. Which of the following pairs of equations best models the relationship between a and b?
a = b + 4
a = b − 1

a = 4b
a = b + 1

b = a + 4
b = a − 1

b = 4a
b = a + 1

Question

Variable a is 4 more than variable b. Variable a is also 1 less than b. Which of the following pairs of equations best models the relationship between a and b?
 a = b + 4 
a = b − 1

a = 4b 
a = b + 1

b = a + 4 
b = a − 1

b = 4a 
b = a + 1

johnweldon1993 · Answer

So we have 'a' and 'b'

If 'a' is 4 more than 'b' ...that is just addition right? a = b + 4

And variable 'a' is  1 less than 'b' so a = b - 1

anonymous · Answer

wait im confused lol, cause its two equations for each answer so im confused rn

johnweldon1993 · Answer

Right which is why we needed to work with them both

if A is 4 more than B...then B + 4 = A
*****************************************First equation we needed

and if A is 1 less than B...then B-1 = A
*****************************************Second equation we needed

So our answer choice with

$\large a = b + 4$ and $\large a = b - 1$ would be correct

anonymous · Answer

thank you so muchh

johnweldon1993 · Answer

Not a problem :) Enjoy your summer!