Choose the Correct Graph: Which Function Passes Through (6,80)?

Function Evaluation with Point Verification

Choose the graph of the function that passes through the point (6,80) (6,80)

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:04 Let's see if the point lies on the line.
00:07 Each point has two numbers: the left one is for X, and the right one is for Y.
00:14 Now, we'll substitute the point into the line equation to check if it works.
00:19 Remember, always solve what's inside parentheses first.
00:24 It works perfectly, so the point is on the line!
00:27 And that's how we solve the problem!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Choose the graph of the function that passes through the point (6,80) (6,80)

2

Step-by-step solution

We want to find which function passes through the point (6,80) (6, 80) . This means we need the function to satisfy the equation y=80 y = 80 when x=6 x = 6 .

Let's evaluate the candidate functions one by one:

  • Function 1: y=5(x+10) y = 5(x + 10)
    Substitute x=6 x = 6 : y=5(6+10)=5×16=80 y = 5(6 + 10) = 5 \times 16 = 80 .
    This function gives the correct output, so it passes through the point (6,80) (6, 80) .

  • Function 2: y=x y = x
    Substitute x=6 x = 6 : y=6 y = 6 .
    The output 6 6 is not equal to 80 80 , so this function does not pass through (6,80) (6, 80) .

  • Function 3: y=2x+3 y = 2x + 3
    Substitute x=6 x = 6 : y=2(6)+3=12+3=15 y = 2(6) + 3 = 12 + 3 = 15 .
    The output 15 15 is not equal to 80 80 , hence this function does not pass through (6,80) (6, 80) .

  • Function 4: y=125x y = 12 - 5x
    Substitute x=6 x = 6 : y=125(6)=1230=18 y = 12 - 5(6) = 12 - 30 = -18.
    The output 18-18 is not equal to 80 80 , hence this function does not pass through (6,80) (6, 80) .

After checking all options, the function y=5(x+10) y = 5(x + 10) is the only one that satisfies the condition. Therefore, the correct answer is y=5(x+10) y = 5(x + 10) .

3

Final Answer

y=5(x+10) y=5(x+10)

Key Points to Remember

Essential concepts to master this topic
  • Point Substitution: Replace x with 6 and check if y equals 80
  • Technique: Calculate y=5(6+10)=5×16=80 y = 5(6 + 10) = 5 \times 16 = 80
  • Check: Only one function should give y = 80 when x = 6 ✓

Common Mistakes

Avoid these frequent errors
  • Not substituting the x-value correctly into the function
    Don't forget to substitute x = 6 into every part of the function = wrong calculation! Students often miss parts like (x + 10) and just substitute into x alone. Always replace every single x in the function with the given value.

Practice Quiz

Test your knowledge with interactive questions

Look at the linear function represented in the diagram.

When is the function positive?

–8–8–8–7–7–7–6–6–6–5–5–5–4–4–4–3–3–3–2–2–2–1–1–1111222333444555666777888–5–5–5–4–4–4–3–3–3–2–2–2–1–1–1111222333000

FAQ

Everything you need to know about this question

What does it mean for a function to pass through a point?

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When a function passes through a point like (6, 80), it means that when you substitute x = 6 into the function, you get y = 80. The point lies exactly on the function's graph!

Do I need to check all the answer choices?

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Yes, absolutely! Even if the first function works, check all options to make sure only one function gives the correct y-value. This confirms your answer is right.

What if I get the wrong y-value when substituting?

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If substituting x = 6 gives you any number other than 80, then that function does not pass through the point (6, 80). Keep checking until you find the function that gives exactly y = 80.

How do I handle functions with parentheses like y = 5(x + 10)?

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Follow the order of operations! First substitute x = 6: y = 5(6 + 10). Then solve inside parentheses: y = 5(16). Finally multiply: y = 80.

Can more than one function pass through the same point?

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Yes, multiple functions can pass through the same point! But in multiple choice questions, usually only one answer choice will be correct for the given point.

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