3. Solve the system of equations by substitution.

X = - 4y

X+5y=2

A. (-8,2)

B. (8,-2)

C. (2/9,-8/9)

D. (-12,3)

4. Solve the system of equations by elimination.

3x+4y=31

2x-4y=-6

A. (4,5)

B. (5,4)

C. (-5,12.5)

D. (5,-4)

3. plug in x=-4y to the second one (x+5y=2), we have: - 4y+5y=2 = > y=2. Then plug y=2 to x=-4y we have x=-4 (-2) = 8. So the answer will be A: (8,-2)

4. For this one, you add the first equation to the second one, 3x plus 2x = 5x, 4x plus - 4x = 0, 31 plus - 6 = 25. Then we get the final equation is : 5x=25, solve for x we get x=5, plug x=5 to any equation, we get y = 4. So the answer will be B (5,4)