There’s no picture u should repost
Divide both sides by the number in front of x
so
4x=-16
x=-4
12=-3x
x=-4
-21=7x
x=-3
6x=-30
x=-5
Answer:
number 2
Step-by-step explanation:
from the original equation you can multiple the m to the x's first.
y-y1=mx-mx1
if you moved mx1 to left the sign will change from - to +
so you y- y1+mx1= mx
then to get x
(y- you + mx1 )/ m = x
hope it helps
Answer:
<em>The jar contains 156 grams of zinc</em>
Step-by-step explanation:
<u>Ratios</u>
Let's call
Z=gr of zinc
C=gr of copper
We know the ratio between them in a certain chemical is:

The jar of the chemical contains C=663 gr of copper. Calculate the grams of zinc by solving the above relation for Z:
Multiplying by C:

Substituting the value of C:

Z=156 gr
The jar contains 156 grams of zinc