Question

Decide whether you would use the graphing, substitution, or elimination method to solve the following system of equations. Explain, in complete sentences, why you chose that method.
Part 2: Solve the following system of equations and show all of your work.

2x + 5y = −3
−15x − 5y = −10

Answer 1

elimination because it would be easy to eliminate in that type of quadratic equation

Answer 2

What about part 2? Can you answer it?

Answer 3

yes
hold on give me a second

Answer 4

y = -5/6 i think

Answer 5

no wait

Answer 6

y = -1

Answer 7

sorry

Answer 8

How did you get y =-1 ?

Answer 9

do you know how to eliminate? because all I did was add the first equation to the second, found X, then after finding X you plug it in the equation to find Y.

Answer 10

Would you mind showing me?

Answer 11

ok give me like a second.

Answer 12

-13x=-13

Answer 13

because I added both equations

Answer 14

and then u simplify. so X=1 because i divided -13 by -13

Answer 15

What do you mean you added both equations. i dont understand how you got -13

Answer 16

then u plug it in to any of the equations. 2(1)=5y=-3
5y= -5 y= -1

Answer 17

ok so I added both equations together.

Answer 18

2x +5y = - 3
-15x - 5y = -10

Answer 19

i add -3 and -10, add 2x and -15x, and add 5y and -5y

Answer 20

and 5y - 5y=0 so now you are left with -13x =-13

Answer 21

Ohhhhhhhhhhh Now i get it

Answer 22

I appreciate the help and breakdown

Answer 23

yep. thats elimination. but that was an easy one.

Answer 24

whenever you use elimination, you always want to get either X or Y by themselves. this means you might have to multiply the first equation by a certain number to get either X or Y equal to 0 when you add them. I suggest going to your teacher for help because its very complicated