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3 years ago

John is twice as old as Mary. The sum of their ages is 21. How old is Mary?

1 answer:

6 0

J=john
m=mary
j is 2 times as old as mary
j=2 times m

sum is 21
m+j=21
find mary
subsitute

j=2m therefor subsitute 2m for j
m+2m=21
add like terms
3m=21
divide by 3
m=7

mary=7

*HOPE I HELPED!*

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2 years ago

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2 years ago

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vova2212 [387]

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Cyclist A lives farther from the Orchard

Step-by-step explanation:

Given

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To do this, we simply calculate the y intercept.

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To calculate y intercept, we set $x = 0$

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