Using information about a force to calculate the resulting acceleration..Using the change in the volume of a gas to calculate the change in its pressure.
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yes
Yes, some equations have as many as ten. There is a very rare equations that only two people have seen that has 1 billion solutions.
A system of equations.
I assume you meant y - 3x = 4. There are multiple solution for it. You can only find specific answers for equations in two variables if two distinct equations are given. One possible answer can be- x = 1, y = 7.
Three different kinds: none, one and infinitely many.