How would you find the first number?
2007-10-05 12:19:57 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
let the number be x
the second will be 172 - x
x + 8 = 5 (172-x)
x + 8 = 860 - 5x
x+5x = 860-8
6x= 852
x= 852/6
x= 142
2007-10-05 12:23:49 · answer #1 · answered by Monah 3 · 1⤊ 1⤋
X= first number.
172-x =second number.
x=5(172-x)-8.
x=860-5x-8.
6x=852.
x=142 (first number)
172-142=30 (second number).
2007-10-05 19:28:44 · answer #2 · answered by Joseph F 5 · 1⤊ 1⤋
or
5x-8+x = 172
6x = 180
divide 180 by 6
x = 30
(5x30) - 8 = 142
2007-10-05 19:26:31 · answer #3 · answered by Anonymous · 1⤊ 1⤋
x + y = 172
y = 5x-8
x + (5x-8) = 172
6x - 8 = 172
6x = 180
x = 30
y = 5x-8 = 5(30) - 8 = 150 - 8 = 142.
2007-10-05 19:25:44 · answer #4 · answered by mazdamandan 4 · 1⤊ 1⤋
5x-8+5x=172
10x-8=172
10x-8+8=172+8
10x=180
10x/10=180/10
x=18
Check:
5x-8+5x=172
5(18)-8+5(18)=172
90-8+90=172
180-8=172
172=172
Thus, your first number is 5(18)-8=82.
Your second number is 5(18)=90.
2007-10-05 19:35:57 · answer #5 · answered by Anonymous · 0⤊ 3⤋
x + y = 172
x = 5y - 8
5y - 8 + y = 172
180 = 6y , y = 30
x = 142
2007-10-05 19:24:12 · answer #6 · answered by Axis Flip 3 · 1⤊ 0⤋
6x-8=172
6X=180
X=30
2007-10-05 19:24:07 · answer #7 · answered by aebaby 1 · 1⤊ 2⤋