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arsen [322]
3 years ago
5

Please help :')

Mathematics
2 answers:
nordsb [41]3 years ago
7 0

Let

x---------> represents Martin's sister's age

y--------> represents Martin's  age

we know that

y=x-6 --------> equation 1

x+y\leq 22 --------> equation 2

Substitute equation 1 in equation 2

x+[x-6]\leq 22\\2x\leq 22+6\\ x\leq 14

therefore

<u>the answer is</u>

Part a) An inequality that can be used to represent this situation is

x+[x-6]\leq 22 or x\leq 14

Part b) the oldest age Martin's sister can be is 14 years old

dolphi86 [110]3 years ago
3 0
X - 6 + x < 22
2x < 28
x<28/2
x<14

The answer is x<14 (Martin's sister is less than 14 years old)
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