Answer:
a. 2x+4y=100
b. 2 questions
Step-by-step explanation:
For a, you can write out hat equation, which can test if a specific combination will work, and once you have one variable, you can solve another
For b, you can plug 24 into the equation
2x+4(24)=100
2x+96=100
2x=4
x=2