Question

If you were to solve the following system by substitution, what would be the best variable to solve for and from what equation?





A. y, in the first equation
B. x, in the second equation
C. x, in the first equation
D. y, in the second equation

Answer 1

click on it

Answer 2

@johnweldon1993

Answer 3

the second can be factored by 3
then use x = expression to be substituted in the first

Answer 4

Hmm, I would solve for 'x' in the second equation...by why?

Notice how in the equation \(\large 3x -12y = 15\) every number is divisible by 3

Answer 5

If we were to solve that for 'x' we have

[\large x = 5 + 4y\]

nice an even numbers...

whereas in the first equation \(\large 2x + 6y = 9\) no matter what we solve for ...not everything is divisible by 2...or 6 ...so that would give s fractions...and who wants that lol