exam Maths Puzzle Numerical Ability

ok i need help with this problem:
1x+2y=2
-4x+3y=25
using the elimination process

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exam Other Question

Given f(x) = x^2 -f if x <-1
3x+2 if x >- -1 , find f(-1) can someone Please show me how to solve inequality, giving its solution set in both intervals and graph forms, and check my answer? Thanks!

-2m > 10