Answer:
2
Step-by-step explanation:
[tex]\frac{4-y}{3-10} = -\frac{2}{7}\\\\\frac{4-y}{-7} = -\frac{2}{7}\\\\4-y = -\frac{2}{7} * -7\\\\4-y = 2\\\\y = 4-2\\\\y = 2[/tex]
Feel free to mark this as brainliest! :D