Question

Which of the following ordered pairs represents the solution to the system given below?

x − 3y = 12
2x + 6y = 60

(0, −4)
(12, 0)
(3, 21)
(21, 3)

Answer 1

rearrange one of the equations to solve for y or x, and then sub it into another.

Answer 2

So take the first equation and make it \[-3y = -x + 12\]

Answer 3

Which is \[-y = \frac{ -x }{ -3} - 4\]

Answer 4

i meant y not -y

Answer 5

y = \[1/3x -4\]

Answer 6

so then take that and plug it in to 2x + 6y = 60
\[2x + 6(1/3x−4) = 60\] and then simplify

Answer 7

Agh, don't tell them the answer.

Answer 8

I didn't...

Answer 9

@NotTim @Jackmullen10 do I use the substitution method.

Answer 10

Yes. Definitely. that's what he and I said.