Question

For the following system, use the second equation to make a substitution for y in the first equation.

3x + y = 1

y + 4 = 5x

Answer 1

The second equation is \[y+4=5x\]
Now we get, \[y=5x-4\]
The first equation is \[3x+y=1\]
Substituting the second equation, we get \[3x+5x-4=1\]
That implies, \[3x+5x=1+4\]or\[3x+5x=5\]or\[8x=5\]or\[x=5/8\]Solved.