Give the following equation in standard form:

x - 3y = 21

Step-by-step explanation:

To write linear equation in standard form we write variables in one side and constant numbers on the the other side

for

we first need to get rid of fraction and to do that we multiply both sides of the equation by 3

3 × y = (x/3 - 7) × 3

➡

3y = x - 21

Now we subtract 3y and add 21 to both sides

21 + 3y - 3y = x - 21 - 3y + 21

➡

x - 3y = 21

Some rules : x cannot be negative, and there shouldn't be fraction.

Standard form of equation:

ax + by = c

45

step-by-step explanation:

r(0,90)(x,y) . t(-5,0)

last option

step-by-step explanation:

∆def to ∆d"e"f"

- rotate 90 counterclockwise degrees

- then translated 5 to the left (x --> x - 5)

answer is the last option