Posted by Anonymous on Saturday, January 10, 2009 at 2:21pm.
I forgot how to solve for two variables... Please check if I solved both problems properly! Thank you.
Equations: (solve for t and z)
12t + 4z = 80
2t + 4z = 20
My answer: t = 2, z = 14
The steps:
(simplified it)
z = 20  3t, z = 5  0.5t
(equated both sides to isolate for t)
20  3t = 5  0.5t
t = 2
(sub t = 2 into one of the equations)
z = 20  3(2)
z = 14

Equations: (solve for t and z)
z = 2 + 6t
z 20  3t
My answer: t = 2, z = 14
(I did the same steps like the previous question, my answer is kind of iffy because it's the same???)

Basic Math  bobpursley, Saturday, January 10, 2009 at 2:28pm
Your answers are wrong.
203t=5.5t does NOT come out t=2
redo that. Another quick way to do this is take your original equations, subtract the second from the first, and you get
10t=60 which is pretty fast to solve in your head.

Basic Math  doug, Saturday, January 10, 2009 at 2:43pm
3
Answer This Question
Related Questions
 Geometry :(  this maths problem is wrecking my head.... 1.find the points of ...
 math  could someone please check these problems for me? Thank you! 1. 0.7x<...
 math  could someone please check these problems for me? Thank you! 1. 0.7x<...
 DRWLS CAN YOU ANSWER  How do i solve inequalitites with three variables. I ...
 College Algebra  Translate the problem into a pair of linear equations in two ...
 How do I do this.?(Math.)  Use the Substitution method to solve the system of ...
 algebra  Translate the problem into a pair of linear equations in two variables...
 Calculus  Please check my answers. Solve the following equations and/or system ...
 Calculus  For the parametric curve defined x=2t^312t^230t+9 and y=t^24t+6 .....
 Discrete Math  I am really stuck on these problems. I've worked a lot of them ...
More Related Questions