Firstly the equation would be y=7.7x+59
(A)The slope is 7.7 (B) and shows that there is a 7.7 charge per week the person attends.
(A)The y intercept is 59 (B) and is the initial fee that the gym charges.
Just a moment while I review this
A(b+c)=a•b+a•c
18=18•1
54=18•3
18(1+3)=18•1+18•3
Good luck
Red hots = x
Gummy bears = y
3x + y = 21
5x + 3y = 39
y = 21 - 3x
Bring that into 5x + 3y = 39
5x + 3(21 - 3x) = 39
5x + 63 - 9x = 39
4x = 24
x = 4
Bring that into 3x + y = 21
3(4) + y = 21
y = 21-12
y = 9
Hope this helps.
- Max