Question 782276
x = Jacob's age now
x + 5 = Chris' age now


x + 4 = Jacob's age in 4 years
x + 9 = Chris' age in 4 years {added 4 onto current age}


x + 9 = 2(x + 4) {in 4 years, Chris will be twice as old as Jacob}
x + 9 = 2x + 8 {used distributive property}
9 = x + 8 {subtracted x from each side}
x = 1 {subtracted 8 from each side}
x + 5 = 6 {substituted 1, in for x, into x + 5}


Chris is 6 now
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