Answer:
B
Step-by-step explanation:
She needed to subtract 36 from both sides of the equation, instead she added 36 to the right side.
Answer:
-2x+y=12
Step-by-step explanation:
linear equation
Tada, Its on the Image. Hoped I helped :)
Cramer's rule works as follows:
x+3y=16
3x+y=8
Then
x=Dx/D
y=Dy/D
where Dx,Dy,D are 2x2 matrices formed from of coefficients and right hand side.
D=
1 3
3 1
=1-9=-8
Dx=matrix D with first column replaced by the vector [16,8]=
16,3
8 1
=16-24
=-8
Dy=matrix D with second column replaced by the vector [16,8]=
1 16
3 8
=8-48
=-40
Therefore
x=-8/-8=1
y=--40/-8=5
Check:
x+3y=1+3(5)=16
3x+y=3(1)+5=8 ok.
C is your answer
because (4, -6) is true, and it lies on both lines, which makes both equations true
hope this helps
