When solving this system by elimination, which variable is the most convenient to eliminate, x or y?
2x + y = 7
3/2 x - y = 7/2

Y is the appropriate variable and the most easiest and convenient to eliminate

name 2x + y = 7 as equation i

and 3/2 x - y = 7/2 as equation ii

then add equation i and ii together

(3/2 + 2) x + y - y = (7 + 7/2)

(7/2) x = (21/2)

x = 3

then put in x = 3 in equation i

4 + y = 7

x = 7 - 4

x = 3

Therefore x = 3 and y = 3

17

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if the probability is 1/12, 75 people will receive a $25 gift card

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