Devon’s teacher requires that students show each step in solving a problem. devon wrote the following when solving the equation x- 7 = 20: x -7 = 20 x -7 = 20 + 7 x = 27 the teacher said that devon’s work was not shown correctly. why? a) devon’s final answer should be 13 b) devon should have shown that he added 7 to both sides c) devon should have shown that he subtracted 7 from both sides d) devon should have shown that he added 7 to the left side only

B) Devon should have shown that he added 7 to both sides

Step-by-step explanation:

x-7 =20

add 7 to each side

x-7+7 = 20+7   NOT x-7 = 20+7

x=27

option 2 is correct.

step-by-step explanation:

we are given two inequality equation

x+y> 5 and -3x+2y< -2

first we draw the graph of both function using t-table method

equation: x+y> 5

for x=0, y=5

for x=-5, y=0

table:

x   :   0     5

y   :   5     0

test point (0,0) , 0> 5

false

equation: -3x+2y< -2

for x=0, y=-1

for x=2, y=4

table:

x   :   0     2

y   : -1       4

test point (0,0) , 0< -2

true

now we draw the graph. see the attachment for graph.

common region would be solution set.

option 2 is correct.

ghjmutmum

step-by-step explanation: