To work out y=-5x-10 you can plot a graph.
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say 25x10 you take 20x10 200 then 5x10 50 50 plus 200 equals 250
your solution is x=10. solving algebra means you define what the variable means. 10=x is already there.
2x+x-5 = 10 2x+x = 10+5 3x = 15 x = 5 and y = 0
you need 2 equations to solve for 2 variables
53.5 =(5x10) + (3x1) + (5x1/10)50 + 3 + 5/10