Question

Choose the correct first step(s) to solve the system using substitution.

y = 5x and 2x + 3y = 34
A. (- 5x + y = 0)(-3)→ 15x - 3y = 0
2x + 3y = 34 → 2x + 3y = 34
B. 2x + 3(5x) = 34
C. 5x = 2x + 3y
D. 5x + (2x + 3y) = 34
E. 5x - (2x - 3y) = -34

Answer 1

correct first steps?

Answer 2

y = 5x and 2x + 3y = 34 to solve this system

Answer 3

Any of them will work as a first step to me

Answer 4

the most efficient one tho might be another story

Answer 5

which one would that be?

Answer 6

B seems the most efficient

Answer 7

ok thank you :)

Answer 8

do you know why?

Answer 9

No, can you tell me why?

Answer 10

i can tell you yes.

Answer 11

we are told that y=5x this is the value for y regardless of "x"

so, let us substitute this for all the ys we see

Answer 12

do you see that they subsititued y for 5x in B?

Answer 13

yes I do

Answer 14

then that is all there is to it :)

Answer 15

oh that's simple

Answer 16

Thanks a lot

Answer 17

yw, and good luck :)