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?

The line will shift vertically up by 125°.

The line will shift vertically up by 25°.

The line will shift vertically down by 125°.

The line will shift vertically down by 25°.

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?

The line will shift vertically up by 125°.

The line will shift vertically up by 25°.

The line will shift vertically down by 125°.

The line will shift vertically down by 25°.

lena772 · Answer

@ganeshie8

lena772 · Answer

I think it's A

lena772 · Answer

or maybe C

ganeshie8 · Answer

equation if the experiment starts at -100 :
f(x) = 89x - 100

equation if the experiment starts at 25 :
f(x) = 89x  + 25

ganeshie8 · Answer

f(x) = 89x  + 25
=> f(x) = 89x  -100 + 125

lena772 · Answer

So do you think it goes up by 125 ?

ganeshie8 · Answer

Yes, you're not convinced yet

lena772 · Answer

Yes I am but I wasn't sure if it would go up or down

ganeshie8 · Answer

b = +125  goes up 

b = -125 goes down

ganeshie8 · Answer

=> f(x) = 89x  -100 + 125
                                ^^^^^

ganeshie8 · Answer

we have +125 compared to the other equation,
so it goes up by 125