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Linear Function

Volumes:   Simple Math

Who solved this?

from Rodion Gork's favorite books (what?):
 
101 BASIC Computer Games (old book)
by David H. Ahl
 
Of course no one will try write them in BASIC now
but they look good for porting to Python

Very common problem in computational programming is to determine the underlying law to which some phenomenon obeys. For learning purpose let us practice a simple variant - discovering linear dependence by two given observations (for example, how the price for some product depends on its size, weight etc.)

Linear function is defined by an equation:

y(x) = ax + b

Where a and b are some constants.
For example, with a=3, b=2 function will yield values y = 2, 5, 8, 11...
for x = 0, 1, 2, 3...

Your task is to determine a and b by two points, belonging to the function.
I.e. you are told two pairs of values (x1, y1), (x2, y2) which satisfy the function equation - and you should restore the equation itself.

Test data contains number of test-cases in the first line and then test-cases themselves in separate lines. Each case contains 4 integer numbers. Results should be integer too and you are to write them in line, separating with spaces and enclosing each pair in parenthesis, for example:

input data:
2
0 0 1 1
1 0 0 1

answer:
(1 0) (-1 1)
You need to login to get test data and submit solution.