Luke and Mark went out to lunch. Luke bought one sandwich and one cup of soda for $3.10. Mark bought 2 sandwiches and 3 cups of soda for $8.15. What is the cost of a
cup of soda?
Use s to represent cost of sandwiches.
Use c to represent cost of cups of soda.

a = 11 : 4

b = 38

c = 1 for every 6

37/3

step-by-step explanation:

step 1: simplify both sides of the equation.

7x+8(x+

1

4

)=3(6x−9)−8

7x+(8)(x)+(8)(

1

4

)=(3)(6x)+(3)(−9)+−8(distribute)

7x+8x+2=18x+−27+−8

(7x+8x)+(2)=(18x)+(−27+−8)(combine like terms)

15x+2=18x+−35

15x+2=18x−35

tep 2: subtract 18x from both sides.

15x+2−18x=18x−35−18x

−3x+2=−35

step 3: subtract 2 from both sides.

−3x+2−2=−35−2

−3x=−37

step 4: divide both sides by -3.

−3x

−3

=

−37

−3

x=

37

3

hope this is what you were asking for!

step-by-step explanation:

in total they made   333.74 your welcome : d