SOLUTION: how do i solve these two equations by using cramers rule? 20t+50f=1800 and 2f=t

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Question 251413: how do i solve these two equations by using cramers rule?
20t+50f=1800 and 2f=t
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
solve these two equations by using cramers rule?
20t+50f=1800
and 2f=t
-----------------
Rearrange
2t + 5f = 180
t - 2f = 0
---------------
Coefficient determinant:
2...5
1..-2
-------------
D = (2*-2)-(5*1) = -9
==========================
x-determinant:
180...5
0.....0
Dx = (180*0)-(5*0) = 0
==========================
y-determinant
2....180
1.....0
Dy = (2*0)-(180*1) = -180
==========================
x = Dx/D = 0/-9 = 0
y = Dy/D = -180/-9 = 20
===========================
Cheers,
Stan H.