The system of equations can be solved using linear combination to eliminate one of the variables.
2x - y = -4 10x - 5y = -20
3x + 5y = 59 - 3x + 5y = 59
13x = 39
which equation can replace 3x + 5y = 59 in the original system and still produce the same solution?
2x - ya 4
10x - 5y = -20
7x = 39
13x = 39

explanation:

previous steps have made pa≅ pb ≅ st ≅ su. setting the compass width to ab allows you to make tu the same length. then δstu ≅ δpab by the sss congruence postulate, and ∠p ≅ ∠s by the reason cpctc.

127

whether it's diameter, or radius, i believe if i remember correctly from school, every amount has to always add up to 180. so if you take 53, and starting adding, long story short, taking 127 and adding it to 53, gives you 180.

so the possibilities of the measurement of the side of the triangle are either it is longest side or not the longest side

when it is the longest side

s < 25 + 35s < 60

if it is not the longest side

35 < 25 + s10 < sso 10 < s < 60so the perimeter70 < p < 130