Step-by-step explanation:
7x + 8y = -12
8y=-12-7x
y=

Number line graph with closed circle on 30 and shading to the right
because you already have 30 dollars and they need at least 120 but if they get more then 120 they can still hold the science fair.
X - 1/2 because difference is subtraction
Yes. For example, the shape I will use is the circle.
No matter how you rotate the circle, it will always look the same. If you reflect the circle over any drawen line in which it passes through the middle, the two halves created would be congruent.
~<em>Rise Above the Ordinary, Senpai</em>