anonymous one year ago Please, please, please help! I need help with 2 questions. I'll fan/medal. ------ A system of equations is given below: y = 3x + 4 2x + 3y = 10 Which of the following steps could be used to solve by substitution? 3x + 4 = 2x + 3y 2x + 3(3x + 4) = 10 2(3x + 4) + 3y = 10 3(y = 3x + 4) ----- A set of equations is given below: Equation S: y = x + 9 Equation T: y = 2x + 1 Which of the following steps can be used to find the solution to the set of equations? x = 2x + 1 x + 9 = 2x x + 1 = 2x + 9 x + 9 = 2x + 1

1. anonymous

1) When using susbstion its best to use it if it tells you that a varible equals something y = 3x + 4 2x + 3y = 10 In this case it is a given that y equals something so we use that information and plug it into the 2nd equation like this $$\huge\rm\color{black}{2x + 3(3x+4)=10}$$

2. anonymous

It erased my work here is what i had typed http://prntscr.com/7qa7fu

3. anonymous

That should take care of #1

4. anonymous

Try #2 by yourself let me know what you get

5. anonymous

@Moe95 Okay so since #2 tells us what y equals on both equations, shouldn't I combine the two equations? Or do I try for x?

6. anonymous

@Moe95 And thank you btw

7. anonymous

You are welcome and yes! Thats exactly what you do! So the answer is......*drum rolls* ...

8. anonymous

@Moe95 The answer for #2 is D ? :D

9. anonymous

yes! :D Good job! :)

10. anonymous

@Moe95 Thank you so much for helping me!

11. anonymous

No problem! :)