A system of linear equations is shown below as well as the first steps that Raffi is using to solve this system by substitution. Choose the statement that best describes how Raffi is progressing toward a solution.
7x+y=4
3x−2y=3
Raffi's first step: Solve the first equation to obtain y=−7x+4
Substitute this into the second equation to get 3x−2 ∘−7x+4=3
(1 point)
Responses
Raffi needs to simplify the expression.
Raffi needs to simplify the expression.
Raffi substituted in the wrong equation. He should have substituted into the first equation.
Raffi substituted in the wrong equation. He should have substituted into the first equation.
Raffi forgot to place the substituted expression in parentheses.
Raffi forgot to place the substituted expression in parentheses.
Raffi should have substituted for x in the second equation.
Raffi should have substituted for x in the second equation.
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