Mark M. answered 02/07/15
Tutor
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Retired Math prof with teaching and tutoring experience in trig.
Let x = number of calories in the shot
y = number of calories in the can
Then, x + y = 97
y = 4x + 2
Substitute for y in the first equation: x + (4x + 2) = 97
5x = 95
x = 19
y = 97 - x = 78
There are 97 calories in the can and 19 calories in the shot.