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Sagot :
Lets represent:
x=Eric's age
y=Lucas's Age
The first equation:
x=2y
The second equation:
x-4=y+4
Substitute
2y-4=y+4
Subtract y to both sides
y-4=4
Add 4 to both sides
y=8
Therefore: Lucas's age is 8 while Eric's age is 16.
Hope this helps =)
x=Eric's age
y=Lucas's Age
The first equation:
x=2y
The second equation:
x-4=y+4
Substitute
2y-4=y+4
Subtract y to both sides
y-4=4
Add 4 to both sides
y=8
Therefore: Lucas's age is 8 while Eric's age is 16.
Hope this helps =)
We let Lucas' age be x, this would make Eric's age 2x.
From the second sentence we would have;
[tex]2x-4=x+4 \\ 2x-4-x=x+4-x \\ x-4=4 \\ x-4+4=4+4 \\ x=8[/tex]
Therefore Lucas' age is 8 and Eric's is 2*8 or 16.
From the second sentence we would have;
[tex]2x-4=x+4 \\ 2x-4-x=x+4-x \\ x-4=4 \\ x-4+4=4+4 \\ x=8[/tex]
Therefore Lucas' age is 8 and Eric's is 2*8 or 16.
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