Hello.
Firstly, let's isolate x on the equation:

Now, we can replace 'x' for 'y' and vice-versa:

Hope I helped.
B, if they would breath in the air it would mess up there lungs
Okay so the problem starts you off with the fraction (1/4). Sharing equally among 3 people would mean that you'd want to divide it by three so your equation would initially look like (1/4) / 3. Having two dividing signs is confusing so what you do is change the dividing into multiplying by the reciprocal of 3 = 1/3... This would make your expression (1/4) * (1/3) and when you simplify this you should get 1/12 as the answer.
Answer:
total balloons = 120r+72y
Step-by-step explanation:
If there are 120 cases of red balloons and r red balloons in each cases
Number of red balloons = 120*r
If there are 72 cases of yellow balloons and y yellow balloons in each cases
Number of yellow balloons = 72y
The total number of balloons is red balloons plus yellow balloons
total balloons = 120r+72y