Which of the following has a graph that is a straight line?

equation 1: y = 4x^3 + 6
equation 2: y = 5x − 4.5
equation 3: y^2 = x − 1
equation 4: y = 2x^2 + 6

y=5x - 4.5

Step-by-step explanation:

I took the test

i think the answer is b.

step-by-step explanation:

not 100% sure though.

answer: 33 ( approx)

step-by-step explanation:

since, in the linear regression formula, the slope is the a in the equation y = b + ax ( by comparing it with the general equation of line y = mx + c )

where,

here given table is,

price ($), x   :           18         23       25       29       30       33

pairs sold, y :         16         13         10       8         6       2

so, ,   ,   ,

and   ,

thus, slop of the given line is,

⇒  

⇒   ≈ 33