Question

kenneth looks at the graph and says the solution is $(1.5, 3)$.
substitute 1.5 for $x$ and 3 for $y$ in the second equation.
$y = 6 - 2x$
$\square = 6 - 2(\\ ? )$

Explanation:

Step1: Substitute y with 3

$3 = 6 - 2(\text{?})$

Step2: Substitute x with 1.5

$3 = 6 - 2(1.5)$

Answer:

Left box: $3$
Right box: $1.5$