Answer:
x=5
Step-by-step explanation:
<h3>Answer:</h3>
63 liters
<h3>Explanation:</h3>
The amount of fuel used per day is ...
... (1 tank - 2/3 tank)/(6 days) = (1/3 tank)/(6 days) = (1/18) tank/day
Then the amount of fuel used after 6+11 = 17 days is
... (17 days)×(1/18 tank/day) = 17/18 tank
and the amount remaining is ...
... (1 tank -17/18 tank) = 1/18 tank = 3 1/2 liters
To find the tank size, we can multiply this result by 18:
... 1 tank = 18×(3 1/2 liters) = 63 liters
Answer:
x = 1
y = 3
Step-by-step explanation:
<h2>
<em><u>Substitution Method</u></em><em><u>:</u></em></h2>
Step 1:
Name The Equation
4x + y = 7 ...(1)
3x + 2y = 9 ...(2)
Step 2:
From Equation (1) we get,
4x = 7 - y
i.e.,
x = 7 - y/4
Step 3:
Substitute the value of <em><u>x = 7 - y/4</u></em> in equation (2)
i.e.,
3(7 - y/4) + 2y = 9
21 - 3y/4 + 2y = 9
21 - 3y + 8y/4 = 9
21 - 3y + 8y = 9 * 4
21 + 5y = 36
5y = 36 - 21
5y = 15
y = 15/5
<em><u>y = 3</u></em>
Step 4:
Substitute the value of <em><u>y = 3</u></em> in equation (1)
4x + y = 7
i.e.,
4x + (3) = 7
4x + 3 = 7
4x = 7 - 4
4x = 4
x = 4/4
<em><u>x = 1</u></em>
<h2><em><u>Verification</u></em><em><u>:</u></em><em><u> </u></em></h2>
4x + y = 7 i.e., <em>4(1) + (3) = 7</em>
3x + 2y = 9 i.e., <em><u>3(1) + 2(3) = 9</u></em>
Answer:
9a, 18x, and -2c
Step-by-step explanation:
7+2=9 (keep the variable=a)
8+10=18 (keep the variable=x)
5-6=-1 +8= 7-9=-2 (keep the variable=c)
They can each have a half a sandwich.