Question

Given 3x+y=7

2x-4y=1
if solving by substittution which is equalvent?
a. 3(4y+1)+y=7
b. 2x-4(3x+7)=1
c. 3(1-4y)+y=7
d. 2x-4(7-3x)=1

pls help fast

Answer 1

Answer is d. 2x -4 (7 - 3x) = 1

Step-by-step explanation

First change equation 1 so “y” is on one side
3x + y = 7
Subtract 3x from both sides
y = 7 - 3x

Then substitute value of “y” into equation 2

2x - 4 (7 - 3x) = 1

This is the same as answer d.