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S_A_V [24]
2 years ago
15

Matthew is 7 years older then twice the age of his sister. If Matthew is 13, how old is his sister? (NOT SUBTRACTION,ITS MUCH MO

RE)
Mathematics
1 answer:
Nadusha1986 [10]2 years ago
4 0

S = sisters ages

M =2S +7

M=13

13 = 2S+7

subtract 7 from each side

6 = 2S

divide by 2

3=S

sisters age is 3


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Answer:

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Answer:

x=5, y=2

Step-by-step explanation:

You simply write down what you see:

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Now you want to get equal amounts of x or y. Let's go for x. If we multiply the top eq with 5 and the bottom one with -7, we get:

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Finally, it makes sense to double check by filling in these answers in the original equations, just to see if no mistakes were made:

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