Tim's phone service charges $22.42 plus an additional $0.18 for each text message sent per month. If Tim's phone bill was $26.92, which equation could be used to find how many text messages, x, Tim sent last month? A. $22.42x + $0.18 = $26.92
B. $0.18x - $22.42 = $26.92
C. $0.18x + $22.42 = $26.92
D. $22.42x - $0.18 = $26.92

The following relation is not a function

Ok here we go ..there are plenty of ways to solve such math problems but we will go for the smartest and easiest ..5x+2y=7  -2x+6y=9we rearrange them into the following ..by multiplying the 1st equation by 2 it becomes 10x + 4y = 14we rearrange it and so it becomes 10x = 14 - 4yas for the second equation we multiply it by 5 and rearrange it so it becomes as to the following ..-10x + 30y = 45rearranging so 10x = 30y -45now 10x equals both 14 - 4y and 30y -45so   14 - 4y = 30y -4531 = 26yy= 31/26 = 1.19 or around 1.2so by now we can calculate x easily as  -2x+6y=9so 2x = 6y -9 = 6 * 31/26 - 9 = -1.84  then x = - 0.92 or around -0.9best luck!

It's all about the 4