hey how do you solve this? You have to use substitution..
2007-09-19 08:00:33 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
y=2x+7
y=3x+2
Substitute the value of y from the first equation into the second equation.
2x+7=3x+2
3x-2x=7-2
x=5
Substitute the value of x again into an equation.
y=2x+7
y=2(5)+7
y=10+7
y=17
2007-09-19 08:06:10 · answer #1 · answered by anonymoustjl 2 · 2⤊ 1⤋
2x+7 =3x+2
x = 5
y= 3*5 +2 = 17
2007-09-19 15:24:03 · answer #2 · answered by ironduke8159 7 · 0⤊ 1⤋
So, 2x + 7 = 3x + 2
Well, plug in some guesses til it adds up
x = 2....11, 8 no
x=3...13, 11 no, getting closer
x=5...17, 17..YES! X=5 :)
2007-09-19 15:18:31 · answer #3 · answered by Anonymous · 0⤊ 1⤋
3x = y - 2
x = y - 2/ 3
y = 2 ( y - 2 / 3) + 7
y = ?
y = 2y/3 - 4 / 3 + 7
y - 2/3 y = 17 / 3
1/3 y = 17 / 3
y = 17
2007-09-19 15:05:35 · answer #4 · answered by 4 · 0⤊ 2⤋
x = 5
y = 17
piece of cake
2007-09-19 15:10:34 · answer #5 · answered by Anonymous · 0⤊ 1⤋