Question

Which is an equation of the line through (2, 3) and (0, –1)?

Answer 1

y=2x-1

Explanation:

y=ax+b

since the line is passing in 2 points we will be solvimg 2 equations with 2 unknowns

3=2a+b so 2a+b=3

for equation 2

-1=b so b=-1

substitute b in equation 1

2a-1=3

a=4/2=2

y=2x-1