Ametalworker has a metal alloy that is 20% copper and another alloy that is 65% copper. how many kilograms of each alloy should the metalworker combine to create 100 kg of a 56% copper alloy? the metalworker should use _kilograms of the metal alloy that is 20% copper and _kilograms of the metal alloy that is 65% copper. (type whole numbers.)

The metallurgist must use 20 kilograms of the metal alloy which is 20% copper and 80 kilograms of the metal alloy which is 65% copper.

Step-by-step explanation:

We call the alloy 20% copper.

We call the alloy 65% copper.

Let's call the new version you want to create.

When mixing the M Alloy with the S you want to obtain 100 kg of the new alloy

   (i)

Then

   (ii)

We substitute (i) in (ii)

   (iii)

Now we substitute (iii) in (i)

answer

see attachment

explanation

the given function is

this function has y-intercept at

-4 and a slope of 2.

note that, the graph has a positive slope.

the graph that represents this function is the straight line that moves upward from left to right.

the graph touches the y-axis at -4.

the correct choice is the graph shown in the attachment.

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer