Question

Solve the following system of equations.
3y = 9
9y + 2x = -12

Answer 1

A. (1/3, 15/2)
B. (-1/3, - 15/2)
C. (8, 8)
D. (-39/2, 3)

Answer 2

Well, let's look at the simpler things in life :)
3y = 9, how would you simplify that?

Answer 3

Divid by 3 on both sides?

Answer 4

That's right, and what does that give you?

Answer 5

3

Answer 6

3? that is not an equation ;)

Answer 7

it gives you
y = 3, right?

Answer 8

yeah d;

Answer 9

well, now that you have a y-value, you can simply substitute it on the second equation
giving you a single equation in one variable
go ahead :)

Answer 10

3(3y) + 2x = -12

3(9) + 2x = -12

x = -39/2...

So, 3y = 9

y = 3 D is the answer..

Answer 11

or you could do that ^

Answer 12

Thanks you guys ^.<

Answer 13

Welcome dear..