Question

Solve the system x + 7y = 16 and 3x - 7y = 4 for x. *

Answer 1

Answer:

x=5

Step-by-step explanation:

To start solving this, you want to solve an equation for y. I chose 3x - 7y = 4 for later purposes. Subtract 3x from both sides and divide by -7 to get y = 4 - 3x / -7. Now because we have a value for y in terms of x, plug this into the other equation, x + 7y = 16. It now should look like this: x + 7(4 - 3x / -7) = 16. Now just distribute the 7 and simplify the denominator to get x+ (-4+3x)=16. This can now be 4x +4 = 16, starting to look familiar now. Lastly subtract the 4 from both sides and divide by 4 to get x = 5. Hope this helps!

Answer 2

Answer:

x = 5

Step-by-step explanation:

Answer with full steps in picture.

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