Question

1. find pq

Explanation:

Step1: Set up equation

Since $PQ + QR=PR$, we have $(-1 + 10x)+(7x + 1)=17$.

Step2: Simplify the left - hand side

Combine like terms: $(-1+1)+(10x + 7x)=17$, which simplifies to $17x=17$.

Step3: Solve for x

Divide both sides by 17: $x = 1$.

Step4: Find PQ

Substitute $x = 1$ into the expression for $PQ$. $PQ=-1+10x=-1 + 10\times1=9$.

Answer:

9