Let x the total of Hungry-Man Meals bought.
let y the total of burritos bought.
He decides to buy 50 total frozen entrees.
x + y = 50
If we solve the equation for x
x = 50 - y
We also know that he spends $150 on all the frozen food.
Therefore:
x Hungry-Man Meals for $3.25
y burritos for $2.00
x(3.25) + y(2.00) = 150
3.25x + 2.00y = 150
Now substituting 50-y from the first equation into the second equation and solve for y:
3.25x + 2.00y = 150
3.25(50-y) + 2.00y = 150
3.25*50 - 3.25*y + 2.00y = 150
162.5 - 3.25y + 2.00y = 150
162.5 - 1.25y = 150
Subtract both sides by 150
162.5 - 150 - 1.25y = 150-150
12.5 -1.25y = 0
Add both sides 1.25y
12.5 -1.25y+1.25y= 0+1.25y
12.5 +0 = 1.25y
Divide both sides by 1.25
12.5/1.25 = 1.25y/1.25
10 = y
Substitute 10 for y in the result of the x equation:
x = 50 - y
x = 50- 10
x = 40
So 40 Hungry-Man meals and 10 burritos Jack bought.