Function B has a rate of change ( or slope) of 11-5 / 3-1 = 6/2 = 3
Function L y = 6x + 4 has a rate of change of 6 . Higher than function B.
To find y intercept of function B;
y = 3x + b where b = y intercept, when x = -3 y = -7 so
-7 = 3(-3) + b giving b = 2
y intercept of Function B is 2 and of function L it is 4
L has greatest y intercept