Answer:
x = 9/25, y = 7/25, z = 4/25
Explanation:
step 1: solve for y in first equation to use substitution
y = -2x + 1
step 2: insert into second equation to eliminate y variable and work with two variables
3(-2x+1) + z = 1 (now distribute)
-6x + 3 + z = 1 (bring over the -3)
-6x + z = -2
step 3: now left with -6x + z = -2 and x + 4z = 1, so eliminate z
-6x + z = -2 (multiply by 4)
4(-6x + z = -2)
-24x + 4z = -8
-
x + 4z = 1 (brought down third equation)
-25x = -9
x = 9/25
then just plug in x into the third equation to solve for z, followed by plugging it into the first equation to solve for y. you should end with y = 7/25 and z = 4/25
Human activities that contribute to desertification include the expansion and intensive use of agricultural lands, poor irrigation practices, deforestation, and overgrazing.
Answer:
A)
Explanation:
b and e kills organisms, so it doesn't evolve the diseases. genetic modification causes the plants to be resistant, and doesnt target diseases, so the disease isnt evolved. only antibiotics make diseases evolve, overuse of it causes the disease to develop resistance if it isnt completely killed off.
I fill like the reaction would be distillation or chromatography but distillation has to do with bioling points and chromatography has to do with how far the components separate along the material. but im in chemistry not advance placement.
