book Maths Puzzle Numerical Ability

How do you solve when decimals are involved?

3x-2.5y=7.125
2.5x-3y=7.3125

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book Other Question

what is the triangle-inequality theorem? Write an equation in standard form of the line satisfying the given conditions.
#1. Passes through (1,-4) and (-6,8).
#2. Passes through (7,-3) and has a y-intercept of 2.
please explain how you got the answers to these problems. Thank You.