Given the following system, what is the best first step to solving by substitution? 4x-5y=-2 X=15-4y

4(15-4y) - 5y = -2

Step-by-step explanation:

4x - 5y = -2

x = 15 - 4y:

Substitute x = 15 - 4y into the first equation:

4(15-4y) - 5y = -2

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363