ANSWER
4) 5x + 15 = 35
Step-by-step explanation
We're looking for an equation with the form:
![y=ax+b](https://img.qammunity.org/2023/formulas/mathematics/high-school/mcpu6uygesxn6n22sk2sg80sqe0qv9d97r.png)
If we want this to have only one solution we have to give y a value. This value can be found since we're already given the solution x = 4:
![y=5x+15](https://img.qammunity.org/2023/formulas/mathematics/high-school/a7x3fxxhtrzjfbgqifux266hinw6v68cye.png)
replacing x:
![\begin{gathered} y=5\cdot4+15 \\ y=20+15 \\ y=35 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/42shwbe643zhuejjyh4j9ywc3fqpu0g2vy.png)
Therefore the one-solution linear equation we can construct with this information is:
![5x+15=35](https://img.qammunity.org/2023/formulas/mathematics/college/dj56zhm1wzofc257nd404t6uhh2o92wvml.png)