Question

what is the value of y?

Explanation:

Step1: Analyze the relationship between angles

From the figure, we can see that \(70^{\circ}=y + 30^{\circ}\) (the larger angle is composed of the smaller angle \(y\) and \(30^{\circ}\)).

Step2: Solve for \(y\)

Subtract \(30^{\circ}\) from both sides of the equation \(70^{\circ}=y + 30^{\circ}\).

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Answer:

\(40^{\circ}\)