it says for 19-24 use properties of equality to solve the equation.
19 7X+15=12x+5
how do i do this problem??
2007-09-24 16:53:56 · 10 answers · asked by Max H 2 in Science & Mathematics ➔ Mathematics
im still confused
so
wait how would u do it for this one if i have 2 examples it will help me alot more
-3x+5=2x-10
2007-09-24 17:06:26 · update #1
nvm i got it noww
2007-09-24 17:17:05 · update #2
1. get all x's on one side. Subtract 7x from both sides.
15 = 12x - 7x + 5 that's subtraction prop. of equality
15 = 5x+5 that's substitution prop.
now subtract 5 from both sides to get the term with x in it alone.
10 = 5x that's subtraction prop.
now divide by 5 to get x all by itself.
x = 2 that's division property of equality.
The subtraction property of equality says that you can subtract the same thing from both sides of an equation.
The division prop. says the same thing about dividing both sides.
Substitution says that if 2 things are equal, they can be used interchangably.
2007-09-24 16:59:08 · answer #1 · answered by ccw 4 · 0⤊ 1⤋
19) 7x + 15 = 12x + 5
place x to one side by subtracting 7x on both sides.
=> 7x - 7x + 15 = 12x - 7x + 5
=> 15 = 5x + 5
place the number to one side by subtracting 5
=> 15 -5 = 5x
=> 10 = 5x
divide by 5 to get only x.
10/5 = 5x/5
=> 2 = x [ans.]
2007-09-24 23:58:27 · answer #2 · answered by Anonymous · 0⤊ 1⤋
In detail:
One side would be for the variable.
The other side for the constant:
7x + 15 = 12x + 5
All x's on the right:
15 = 5x + 5
All constants on the left:
10 = 5x
Simplify:
2 = x
2007-09-24 23:58:14 · answer #3 · answered by Ira R 3 · 0⤊ 1⤋
7x + 15 = 12x + 5 *Subtract 5*
7x + 10 = 12x *Subtract 12x to make it equal 0*
-12x + 7x + 10 = 0 *Subtract 10*
-12x + 7x = -10 *Combine like terms*
-5x = -10 *Devide -5 to find x*
x = 2
So, 7(2) +15 = 29
and 12(2) + 5=29
2007-09-25 00:06:05 · answer #4 · answered by Anonymous · 0⤊ 1⤋
here, i could explain it all day or just put out the steps for u. it shouldn't be too hard to figure out.
7x+15=12x+5
subtract 15 from both sides
7x+15(-15)=12x+5(-15)
7x = 12x - 10
Subtract 12x from both sides
7x +(-12x)= 12x+(-12x) -10
-5x = -10
Now divide both sides by -5 to get x.
-5x/-5 = -10/-5
x = 2
Now You Have Your Answer
2007-09-25 00:10:41 · answer #5 · answered by superman 2 · 0⤊ 1⤋
add -5 to both sides: 7x + 10 = 12x
add -7x to both sides: 10 = 5x
divide both sides by 5: 2 = x
so that's addition property of equality twice, then division property of equality.
2007-09-24 23:58:33 · answer #6 · answered by Philo 7 · 0⤊ 1⤋
Take 7x from both sides to get
15 = 5x + 5
Then take 5 from both sides to get
10 = 5x
Then divide each side by 5 to get
2 = x
2007-09-24 23:59:18 · answer #7 · answered by G.V. 6 · 0⤊ 1⤋
7x+15=12x+5
7x+15-5=12x
7x+10=12x
12x-7x=10
5x=10
x=10/5
x=2
2007-09-25 00:03:57 · answer #8 · answered by Ricardo R 3 · 0⤊ 1⤋
19.7x + 15 = 12x + 5
19.7x -12x + 15 = 12x + 5 -12x
7.7x + 15 - 15 = 5 - 15
7.7x = -10
7.7x/7.7 = -10/7.7
x = -100/77
x = - 1/23/77
2007-09-25 00:02:07 · answer #9 · answered by gab BB 6 · 0⤊ 2⤋
Isolate the variable.
2007-09-24 23:56:16 · answer #10 · answered by Anonymous · 0⤊ 2⤋