# Chapter 8 - Systems of Linear Equations and Problem Solving - 8.2 Solving by Substitution or Elimination - 8.2 Exercise Set - Page 516: 9

$(c)$

#### Work Step by Step

y is isolated in equation $1$. The next step is to substitute y for $4x-7$ in the other equation: $6x+3(4x-7)=19$ ... choice $(c)$

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