4x - 9y = -21
- 4x – 3y = 9

(-3,1)

y= 1

x= -3

Step-by-step explanation:

4x-9y=-21

-4x-3y=9

solve the equation

4x=-21+9y

-4x-3y=9

substitute the value of 4x onto an equation

-1(-21+9y)-3y=9

multiply -1 to the numbers in parenthesis

-21+-9-3y=9

add -9 to 9 and put the negative on nine as a positive.

-21-3y=18

add -21 to 18 but since 21 is a negative the equation is subtraction.

-3y=-3

divide Both sides by -3

y=1

substitute the value of y into an equation

-4x-3•1=9

multiply 3 to 1

-4x-3=9

put -3 as a positive and add 3 to 9

-4x=12

divide both sides by -4

x= -3

(-3,1)

answer: the area of the parallelogram below is 42 square meters.

- officialprodixy ☕

answer:

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21  

-7 + ? = 21

-7 + 28 = 21

hope it