Solve for <span>M</span><span> </span><span>by</span><span> </span><span>simplifying</span><span> </span><span>both sides of the</span><span> </span><span>equation</span><span>, then isolating the</span><span> </span><span>variable</span><span>.</span><span>M=<span>−<span>9</span></span></span>
Let x the age of John Amy's age = x + 9 from question, we get, John's age + Amy's age = 23 x+(x+9)= 23 => x + x + 9 = 23 => 2x = 23 - 9 => x = 14/2 => x = 7
