if you were to solve the following systems by substitution, what would be the best variable to solve for and from what equation? explain how please!!

2x+6y=9
3x-12y=15

a) y in the first
b) x in the second
c) x in the first
d) y in the second

Question

if you were to solve the following systems by substitution, what would be the best variable to solve for and from what equation? explain how please!!

2x+6y=9
3x-12y=15

a) y in the first
b) x in the second
c) x in the first
d) y in the second

precal · Answer

mulitply the first one by 2 and then solve for x

precal · Answer

I meant multiply

directrix · Answer

b) x in the second

3x-12y=15

The coefficient of x (3) will divide that of -12 and then also divide 15. When you solve for x in equation two, there will be no fractions.

precal · Answer

Actually it really doesn't matter.  I wonder if this is a computer generated question or if the teacher was trying to do an open-ended question to determine if the students understand the process.