So I need to solve the linear system below using the substitution method. as an ordered pair 4x-2y=2
x=y+4

y=5x-22
3x+2y=34

9x+8y=10
y=-4x+7

x=2y-14
5x-7y=-43

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Someone answer this asap for gabriella uses the current exchange rate to write the function, h(x), where x is the number of u.s. dollars and h(x) is the number of euros, the european union currency. she checks the rate and finds that h(100) = 7.5. which statement best describes what h(100) = 75 signifies? a. gabriella averages 7.5 u.s. dollars for every 100 euros. b. gabriella averages 100 u.s. dollars for every 25 euros. c. gabriella can exchange 75 u.s. dollars for 100 euros. d. gabriella can exchange 100 u.s. dollars for 75 euros.

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.