Seven bags of peanuts and 3 sandwiches cost 22. Three bags of peanuts and 1 sandwiche cost 8. The cost of 1 bag of peanuts is. one sandwich cost

Replace the informations you don't know with letters.

x = number of bags

y = number of sandwiches

7x + 3y = 22

3x + y = 8

Then solve the equations.

First, isolate the y in the second one like this:

y = 8 - 3x

then replace the y in the first equation with its worth from the second equation:

7x + 3 (8 - 3x) = 22

solve for x, then replace the value in the equations to get the value of y