Question

ANSWER ASAP MUST BE CORRECT

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

3x + y = 1
y + 4 = 5x

What is the resulting equation?


3x + 5x - 4 = 1
3x + 4 - 5x = 1
3x + 5x + 4 = 1

Answer 1

Solve the second equation for y so that you can substitute it in for y in the first equation..

y = 5x - 4

Substitute:

3x + (5x - 4) = 1

Answer 2

3x + 5x - 4 = 1

Explanation:

Given the equation

3x + y = 1

We must substitute the following equation:

y + 4 = 5x

So first we'll isolate y from the second equation so that then we can substitute its solution in the first equation:

y + 4 - 4 = 5x - 4

y = 5x - 4

Now we can substitute y in the first equation:

3x + y = 1

3x + 5x - 4 = 1