Two Times a number added to another number is 25. three time the first number minus the other number is 20. find the numbers
2 answers:
Equation 1: 2x + y = 25 -Subtract 'y' (or 1) to both sides 2x + 1 - 1 = 25 - 1 2x = 24 -Divide '2' to both sides 2x/2 = 24/2 x = 12 (I think) Equation 2: 3y - x = 20 -Add 'x' (or 1) to both sides 3y - 1 + 1 = 20 + 1 3y = 21 -Divide '3' to both sides 3y/3 = 21/3 y = 7
2x+y=25 3x-y=20 solve by adding these two equations together 2x+3x=5x y-y=0 25+20=45 you get left with 5x=45 divide both sides by 5 x=9 then plug x=9 into one of the 1st equations to solve for y 2(9)+y=25 18+y=25 subtract y=7 so your numbers are 9 and 7
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