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We want to solve the equation $-2x−16=-8$ using the graph of the function $y=-2x−16.$ The first step is to find the point on the graph where $y=-8.$

This point's $x$-coordinate is the solution to the equation.

Thus, the solution to the equation is $x=-4.$

b

Here we are presented with the graph of the function $y=0.4x+0.6$ and are asked to solve the equation $0.4x+0.6=3$ using it. Let's first find the point on the graph where $y=3.$

Next step is to find this point's $x$-coordinate as it is the solution to the equation.

As we can see in the graph, the equation has the solution $x=6.$