Answer:

Step-by-step explanation:
<u>Step 1: Solve for x in the first equation
</u>


<u>Step 2: Plug in x into the second equation
</u>




<u>Step 3: Plug in y into the first equation
</u>
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Answer: 
Answer:
Yes, if x < -1
Step-by-step explanation:
Is x + 5 less than 4?
x + 5 < 4
x < 4 - 5
x < -1
Yes, if x < -1
Answer:
20
Step-by-step explanation:
locate 10 on the horizontal (x- axis), go vertically up to meet the line at (10, 20)
The corresponding output is the value on the vertical (y- axis )
That is the output is 20