Does anybody know how to do these I’m still learning not to good at it yet:(

y=3x+5

y=-2x-1

y=-4x

y=1/2x+2

Step-by-step explanation:

These are linear functions(y=mx+b).  m stands for the slope and b stands for the y intercept.  After plugging in your slope, you use the coordinates they give you to find the y intercept.  To find the y intercept plug in the y coordinate into the y in y=mx+b, and plug in the x coordinate into the same equation.  

You can also check your answer on desmos graphing calculator.

Hope my explanation made sense! I suck at explaining things lol.

m∠a is 90°

m∠b is 40°