Since we have computer algebra systems that can solve polynomial division problems for us, why is it necessary to learn how to do these things by hand?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.