Let’s solve the first problem step by step.
We are told:
> The sum of two numbers is 20.
> One number is 4 more than the other.
> Find the two numbers.
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Step 1: Let’s call the smaller number
x.
Then, since the other number is 4 more than this one, we can call it
x + 4.
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Step 2: Their sum is 20. So we write the equation:
x + (x + 4) = 20
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Step 3: Simplify the left side:
2x + 4 = 20
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Step 4: Subtract 4 from both sides:
2x = 16
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Step 5: Divide both sides by 2:
x = 8
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Step 6: Now find the other number:
x + 4 = 8 + 4 = 12
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Check:
8 + 12 = 20 → correct.
12 is 4 more than 8 → correct.
Final Answer:
The two numbers are 8 and 12.
Parent Tip: Review the logic above to help your child master the concept of algebra 1 systems of equations worksheet.