Question

For the following system, use the second equation to make a substitution for y in the first equation. 3x + y = 2 y + 4 = 3x

Answer 1

3x+(3x-4)= 2
when you solve for y you gotta put it in slope intercept form. then you can substitute it in to your equation. hope this helps!

Answer 2

x= 1 and y = -1

Explanation:

3x + y = 2

y+ 4 = 3x

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

LEts start with second equaiton y+4 = 3x

Solve for y, subtract 4 from both sides

y = 3x- 4

Now substitute y = 3x -4 in first equation

3x + y = 2

3x + 3x -4 = 2

combine like terms

6x -4 = 2

Add 4 from both sides

6x = 6 (divide by 6)

x= 1

To solve for y we plug in x=1 in y= 3x-4 equation

y=3(1)-4= -1

so x= 1 and y = -1