when 7 times a number is decreased by 8, the answer is the same as when 3 times the number is increased by 4. find the number.
Follow Math Help Forum on Facebook and Google+
Originally Posted by blame_canada100 when 7 times a number is decreased by 8, the answer is the same as when 3 times the number is increased by 4. find the number. 7*x - 8 = 3*x + 4 Solve for x; 4*x = 12 x = 3
Originally Posted by blame_canada100 when 7 times a number is decreased by 8, the answer is the same as when 3 times the number is increased by 4. find the number. In other words: Originally Posted by blame_canada100 7n-8=3n+4 That's your equation, therefore when you subtract both sides by 3n you get: $\displaystyle 4n-8=4$ Add 8 to both sides to get: $\displaystyle 4n=12$ divide by 4: $\displaystyle n=3$
View Tag Cloud