Answer:
y=-7/2x+10
Step-by-step explanation:
7x+2y=20
2y=20-7x
2y=-7x+20
y=-7/2x+20/2
y=-7/2x+10
whip out a calculator punch in the numbers and yell at them to read the answer
Answer:

Step-by-step explanation:
Elimination method:


Add these equations to eliminate x:

Then solve
for y:



Write down an original equation:

Substitute 4 for y in
:




{
and
} ⇒ 
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<em>hope this helps...</em>
Assignment: 
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Answer: 
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Explanation: 
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[ Step One ] Factor out common term 

[ Step Two ] Factor 
\left(4x\right)^2-1^2
[ Step Three ] Rewrite equation

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