What's the problem? Just plug and chug:
D =
|4 2|
|2 6| = 20
Dx =
|120 2|
|210 6| = 300
Dy =
|4 120|
|2 210| = 600
x = Dx/D = 15
y = Dy/D = 30
By Using the Crameres Rule find the solution for the following system of equations
4x +2y = 120
2x + 6y = 210
2 answers
d of
4 2
2 6
is 4*6 - 2*2 = 24 -4 = 20
d of
120 2
210 6 = 720 - 420 = 300
so
x = 300/20 = 15
now you do
4 120
2 210
/ 20 = y
GOOGLE:
lumenlearning.com/boundless-algebra/chapter/determinants-and-cramers-rule/
4 2
2 6
is 4*6 - 2*2 = 24 -4 = 20
d of
120 2
210 6 = 720 - 420 = 300
so
x = 300/20 = 15
now you do
4 120
2 210
/ 20 = y
GOOGLE:
lumenlearning.com/boundless-algebra/chapter/determinants-and-cramers-rule/