Answer:
y = 1/4(x) + 8 <em>or</em> y - 1/4(x) = b, with b's value not mattering.
Step-by-step explanation:
First, convert it to a y = mx + b format. This isn't 100% necessary, just something I prefer to do.
y + 4x = 8
y = -4x + 8
Now switch the numerator and denominator of the 'm', then multiply it by -1.
y = 1/4(x) + 8
The 'b' here can be any value and still be the right answer, as slope determines whether it's perpendicular or not, not where on the y axis the line is. You may need to convert it back to the original format by subtracting the 1/4(x) and moving it to the other side, like so:
y - 1/4(x) = b
160 < 0.75x + 35.50
Subtract 35.59 from both sides to get:
124.50 < 0.75x
Divide both sides by 0.75 to get:
166 < x
She must deliver 166 samples to get $160
I would say that there are 29 boys in the class.
Answer:
![\boxed{x = 10.28 \%}](https://tex.z-dn.net/?f=%5Cboxed%7Bx%20%3D%2010.28%20%5C%25%7D)
Step-by-step explanation:
![\frac{(26.75)x}{100} = 2.75 \\ \boxed{x = 10.280373832}](https://tex.z-dn.net/?f=%20%5Cfrac%7B%2826.75%29x%7D%7B100%7D%20%3D%202.75%20%5C%5C%20%20%5Cboxed%7Bx%20%3D%2010.280373832%7D)