Substitution
-x +y=-5

3x-5y=9

To subsitute you mean
make one side equal to only one placehloder

so -x+y=-5
make equal to y
add x to both sides
y=x-5

subsitute x-5 for y in second equation
3x-5(x-5)=9
3x-5x+25=9
add like terms
-2x+25=9
subtract 25 from both sides
-2x=-16
divide by 2
-x=-8
multiply -1
x=8
subsitute 8 for x in first equation

y=x-5
y=8-5
y=3

x=8
y=3

Just a question- could you organize the data better? i just cannot tell which number are for which bakery. i will be happy to answer this question if you could do this for me! : )