Question #0cec2
2 Answers
Explanation:
#"let the 2 numbers be "x" and "ycolor(white)(x);x>y#
#"then "x+y=18to(1)#
#"and "x-y=12to(2)#
#"adding the equations together will eliminate y"#
#"adding term by term on both sides"#
#(x+x)+(y-y)=(18+12)#
#rArr2x=30#
#"divide both sides by 2"#
#(cancel(2) x)/cancel(2)=30/2#
#rArrx=15#
#"substitute this value into equation "(1)#
#rArr15+y=18rArry=18-15=3#
#"the numbers are "15" and "3#
#15+3=18" and "15-3=12#
Explanation:
Alright, lets think of this problem as two different equations:
We need to get rid of one of those variables. Since there is a positive and a negative
Now we just plug this
Now to check, we are going to plug the
Hope this helped!
~Chandler Dowd