Math Is Fun Forum

Hi math'ers
I'm building a robot, and need to estimate the time it takes to turn x number of degrees.

There are two unknown variables:
y - The time it takes for the robot to start turning after the turning command is sent. (This is constant, but still unknown)
z - The time it takes to turn x number of degrees after the turning starts.

I start with some guessed values for y and z, and after each turn I measure how many degrees was actually turned.

So, some sample data could look like this:
y+38z=850
y+53z=1200
y+80z=1850

how do I estimate y and z with a variable number of sample data?

Thanks in advance