What is the solution of the system? Use substitution.

3x + 2y = 7

y = –3x + 11

A.
(6, –3)

B.
(6, –7)

C.

D.
(5, –4)

Question

What is the solution of the system? Use substitution.

3x + 2y = 7

y = –3x + 11

  A.
(6, –3)

  B.
(6, –7)

  C.


  D.
(5, –4)

dopeeaf · Answer

3x+2y=7 -------------(1) 
y= -3x + 11 ----------(2) 

subs (2) into (1) 

3x + 2( -3x +11) = 7 
3x + (-6x + 22) = 7 
3x - 6x + 22 = 7 
-3x = -15 
x = 5 

subs x = 5 into (2) 

y = -3(5) + 11 
y = -15 +11 
y = -4 


x = 5, y = -4

questionerpersoner · Answer

Think about it if u put if it was (A) 3x6=18 and 2x-3=-6 18+-6 would equal 12