A system of equations is given below:

y = 4x − 3
2x + 7y = 41

Which of the following steps could be used to solve by substitution?
A. 2(y = 4x − 3) + 7y = 41
B. 4x − 3 = 2x + 7y
C. 2x + 7(4x − 3) = 41
D. 2(y = 4x − 3)

Question

A system of equations is given below:

y = 4x − 3
2x + 7y = 41

Which of the following steps could be used to solve by substitution? 
A.  2(y = 4x − 3) + 7y = 41
B. 4x − 3 = 2x + 7y
C. 2x + 7(4x − 3) = 41
D. 2(y = 4x − 3)

anonymous · Answer

Can someone explain to me how solving with substitution works?

pooja195 · Answer

It's basically plugging in a given value in place of  a varible in another equation  
So...
We are already given the value of y take the value of y that is given and plug it in equation 2 in place of y

anonymous · Answer

What would I be substituting here? I do not see where they say the value of y

pooja195 · Answer

"y = 4x − 3" 
It tells you what y ='s

anonymous · Answer

oh my apologies i didnt realize it said y= , i thought it said y- i completely overlooked that

pooja195 · Answer

haha it's alright!

anonymous · Answer

Do you think you could help with one more?

pooja195 · Answer

Well i can after you tell me what u got for this one :)

anonymous · Answer

I got C

pooja195 · Answer

Good job! :) 
ok post the next one

anonymous · Answer

Alright