If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to y from the first equation is substituted into the second equation.

8x - 2y = 4

4x + 5y = -18

Answers:

4x + 5(-4x - 2) = -18

4x + 5(4x - 2) = -18

4(-4x - 2) + 5y = -18

4(4x - 2) + 5y = -18

(my answer is B)

Question

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to y from the first equation is substituted into the second equation.

8x - 2y = 4 

4x + 5y = -18 

Answers: 


		
4x + 5(-4x - 2) = -18
		
4x + 5(4x - 2) = -18
		
4(-4x - 2) + 5y = -18
		
4(4x - 2) + 5y = -18

(my answer is B)

anonymous · Answer

Looks sound

anonymous · Answer

solve for y in the first equation
-2y = 4-8x
y = 4x-2
substitute into 2nd equation

4x + 5(4x-2)  = -18
answer is B your second answer