The product of my age is five, then decreased by twenty and finally increased by my age times the opposite of three is fifty, how old am i
the formula for nth term of a the sequence is given as
finding the 10th term means finding , which means to plug in 10 into n, in the nth term formula.
(x, y) = (3, 5)
it works well to divide the first equation by 2, so the system isx -y = -2x +y = 8
now, adding the two equations together gives
2x = 6
x = 3 . . divide by 2
substituting that into either equation gives you an equation for y.
3 - y = -2
5 - y = 0 . . add 2
5 = y . . . . add y
the solution is (x, y) = (3, 5).