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)

Answer 1

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

Answer 2

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