Um wow, I can't really tell you all of this but I got my answers from "cymath.com" So here is what it says:)
"Solve for <span>xx</span> in <span>2x+2z=4<span>2x+2z=4</span></span>How?
<span>x=2-z<span>x=2−z</span></span>
2 Substitute <span>x=2-z<span>x=2−z</span></span> into <span>-x-y-z=-8<span>−x−y−z=−8</span></span>How?
<span>-y-2=-8<span>−y−2=−8</span></span>
3 Substitute <span>x=2-z<span>x=2−z</span></span> into <span>-4x+4y+5z=7<span>−4x+4y+5z=7</span></span>How?
<span>-8+9z+4y=7<span>−8+9z+4y=7</span></span>
4 Solve for <span>yy</span> in <span>-y-2=-8<span>−y−2=−8</span></span>How?
<span>y=6<span>y=6</span></span>
5 Substitute <span>y=6<span>y=6</span></span> into <span>-8+9z+4y=7<span>−8+9z+4y=7</span></span>How?
<span>9z+16=7<span>9z+16=7</span></span>
6 Substitute <span>y=6<span>y=6</span></span> into <span>x=2-z<span>x=2−z</span></span>How?
<span>x=2-z<span>x=2−z</span></span>
7 Solve for <span>zz</span> in <span>9z+16=7<span>9z+16=7</span></span>How?
<span>z=-1<span>z=−1</span></span>
8 Substitute <span>z=-1<span>z=−1</span></span> into <span>x=2-z<span>x=2−z</span></span>How?
<span>x=3<span>x=3</span></span>
9 Therefore,
<span>x=3<span>x=3</span></span>
<span>y=6<span>y=6</span></span>
<span>z=-1<span>z=−1"</span></span>
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8 gallons/340 miles vs. 7 gallons/350 miles
$32/340 miles vs. $28/350 miles
$1.133/1 miles vs. $0.08/1 mile
113 cents/mile vs. 8 cents per mile
113 cents- 8 cents = 105 cents
The answer is 105 cents/mile.
Answer:
5 L
Step-by-step explanation:
21 cups/ 4.2L per cup =5 L total
Answer
340 times 2= 1,000 times 85= 85,000
Step-by-step explanation: