I believe it would be -17m-4/8
(Answer included in imagine)
Answer:
51 dollars
Step-by-step explanation:
4 times 12.75 =51
With inverse functions you just swap 'x' and 'y' and solve for 'y'.

Swap 'x' and 'y':

Add 7 to both sides:

Take the square root of both sides:
the answer of 2x +y = 20 ; 6x -5y =12
{ explained in image}