Twice a number minus a second number is -1. twice the second number added to three times the first number is 9. find the two numbers

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12-10-2017
Mathematics

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Twice a number minus a second number is -1. twice the second number added to three times the first number is 9. find the two numbers

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ejelonubenedict ejelonubenedict · Answer 1 · 2017-10-14T10:57:58+02:00

ejelonubenedict ejelonubenedict

14-10-2017

let the first number be X
and the second be Y
so 2x-y= -1 ---------(1)
2y+3x=9 ______(2)
solve the simultaneous eqn
from eqn (1) y= 2x+1 _____(3)
sub eqn (3) into eqn(2)
2{2x+1} +3x=9
4x+2+3x=9
7x=9-2=7
x=1
sub x=1 into eqn (3)

y=2(1)+1 = 2+1 =3

the two numbers are 1 & 3

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