If I give my brother 5 dollars, then we will have the same amount of money. If instead he gives me 25 dollars, then I'll have twice as much money as he will have. How much money does my brother currently have (in dollars)?
+37147 y = your money
b = brother's money
y-5 = b+5 Given
2 ( b-25) = y + 25 Given
From the first equation y = b + 10 sub this value of 'y' into the second equation to get
2 ( b-25) = (b+10) + 25
2b - 50 = b + 35
b = 85 dollars ( and y = 95)
