You add the equations together making sure one of the variables disappears by making one negative and one positive. In this situation y would alrady disappear 8x+y=-16
Answer:
68
Step-by-step explanation:
4 (x-3)=3x-4
4x-12=3x-4
4x-12-3x=3x-4-3x
x-12=-4
x-12+12=-4+12
x=8
<em>1. x = - 7/3 = - 2 1/3</em>
<em>2. x = -2</em>
- Step-by-step explanation:
<em>Hi there ! </em>
<em />
<em>3x + 12 = - 6x - 9</em>
<em>3x + 6x = - 12 - 9</em>
<em>9x = - 21</em>
<em>x = - 21⁽³/9</em>
<em>x = - 7/3</em>
<em>x = - 2 1/3</em>
<em />
<em>12x + 20 = 2x</em>
<em>12x - 2x = - 20</em>
<em>10x = - 20</em>
<em>x = - 20/10</em>
<em>x = - 2</em>
<em />
<em>Good luck !</em>
Answer:
4 books for $26
Step-by-step explanation:
4 books for $26
Take the price and divide by the number of books
$26/4 =$6.50 per book
6 books for $42
Take the price and divide by the number of books
$42/6 = $7.00 per book
The better buy is 4 books for $26
