Eighth grade aa.8 solve a system of equations using substitution clouds solve using substitution. 4x + 7y = 9 y = 3 ( , ) submit

 (-3, 3)

Step-by-step explanation:

4x + 7y = 9

y = 3

Replace "y" with "3" in the first equation to solve for x:

4x + 7(3) = 9

4x + 21 = 9

4x         = -12       subtracted 21 from both sides

 x         = -3          divided both sides by 4

the correct answer is d

hope this

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk