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Revenue-expenses= profit or loss. Hope this helps!(:
x + y = 22000 {equation 1} [where x & y are the 2 investments] 1.07x + 1.02y = 22920 {equation 2} [after the profit was made] Multiply equation 1 by 1.07 1.07x + 1.07y = 23540 {equation 3} {equation 3} - {equation 2} 1.07x - 1.07x + 1.07y - 1.02y = 23540 - 22920 0.05y = 620 y = 12400 Sub this into {equation 1} x + 12400 = 22000 x = 9600 The original investments were $9600 and $12400 respectively.
Numerals are what MAKE the equation.
profit = selling price - (cost of buying + overheads)
an equation is a number sentence with and = sign