{x+7=2y+1 ⇔ x-2y=1-7 ⇔ x-2y=-6
{3x-y=7 /*(-2)
{x-2y=-6
<u>{-6x+2y=-14 </u>(+)
<em>x-6x-2y+2y=-6-14</em>
<em>-5x=-20 </em>/:(-5)
x=4
x -2y=-6
4-2y=-6 /-4
-2y=-10 /:(-2)
y=5
<em>Solution: (4; 5)</em>
Answer:
y=-13
Step-by-step explanation:
Plugging in -7:
y= (-7)2 + 1
-7 * 2 = -14
So:
y= -14 + 1
-14+1=-13
$2.39
to find the cost of 1 pound , divide the cost of 4 pounds by 4
$9.56 ÷ 4 = $2.39
