Answer is 350 hamburgers
First our equations:
We know there are x cheeseburgers and y hamburgers for total of 772.
And
y hamburgers = x + 72 cheeseburgers
x + y = 772
y = x + 72
Solve
Substitute the 2nd equation “y” value into the “y” position of the first equation
x + x + 72 = 772
2x + 72 = 772
subtract 72 from both sides
2x + 72 - 72 = 772 - 72
2x = 700
divide both sides by 2 to solve for x
X = 350 hamburgers
Check your work.
Using your first equation solve for y
x + y .= 772
350 + y = 772
350 - 350 + y = 772 - 350
y = 422
Now substitute in values for x and y
350 + 422 = 772
772 = 772
Problem solved!
