James is solving the system below:
-4x + 8y = 10
7x + 9y = 19
He wants to eliminate x and said that he needs to multiply the first equation by 8 and the second equation by 3. Is this correct? Justify your answer. If incorrect, describe the error.

Question

James is solving the system below:
-4x + 8y = 10
7x + 9y = 19
He wants to eliminate x and said that he needs to multiply the first equation by 8 and the second equation by 3.  Is this correct?  Justify your answer.   If incorrect, describe the error.

anonymous · Answer

Multiply both the equations as appropriate and see?

anonymous · Answer

$$8(-4x+8y=10) = ~?$$
$$3(7x+9y=19) = ~ ? $$