Solving systems by addition method

x-3y=-1
-5x+3y=-7

i think i did somethin wrong because for x i got 2 and for y i got 1. but i don't know what i did wrong.

Drag each scenario to show whether the final result will be greater than the original value, less than the original value, or the same as the original value. 1. a 25% decrease followed by a 50% increase 2. a 20% decrease followed by a 25% increase

If 1 is divided by the sum of y& 4. the result is equal to 3 divided by 4 .find the value of m?

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.