Question

A science experiment begins with a metal at -100° Celsius. The following function describes the temperature change per minute: f(x) = 89x - 100°. How will the graph of this function change if the metal is at 25° at the start of the experiment?

A.The line will shift vertically up by 125°.

B.The line will shift vertically up by 25°.

C.The line will shift vertically down by 125°.

D.The line will shift vertically down by 25°.

Answer 1

It's obviously not C or D because you have a positive slope, meaning your line is increasing (going up).

Answer 2

well the starting temp of -100 is the vertical axis intercept

or given the standard form

y = mx + b

-100 is b

is the starting temp changes to 25...

the line moves up the vertical axis to b = 25

so it moved up 125 units