5x - 2y = 15 2x + 4y = 12 According to the strategy you learned in this lesson, what is the best first step in solving the system of equations above using substitution?

Step-by-step explanation:

Solve equation [2] for the variable y

(2) 4y = 2x - 12

(2) y = x/2 - 3

/ / Plug this in for variable y in equation [1]

(1) 5x - 2• (x / 2-3) = 90

(1) 4x = 84

/ / Solve equation [1] for the variable x

(1) 4x = 84

(1) x = 21

By now we know this much:

x = 21

y = x/2-3

Use the x value to solve for y

y = (/2) (21) - 3 = 15/2

Solution:

{x, y} = {21,15/2}

The answer is C = Solve for x in the second equation.

Step-by-step explanation:

I did the assignment.