Answer: B, C, D
Step-by-step explanation:
A linear function is a straight line and is written as y=mx+b
A y = 10x is linear
B y = -5x-15 is linear
C y = 2x^2+10 is not linear (the x^2 makes it a parabola)
D y = 12x + 1 is a straight line
E y = -20 is straight line through -20 on the y-axis
F y = 7x^2 + 4 is not a straight line
