Can somebody help with this please

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Given that abcd is a rhombus, what is the value of x?

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label?