I forgot to add what to solve for on the last question for 2.
But I do have a few questions I didn't understand.
1.) ax+z = aw+y, for a
2.) q = p(r+s), for r
And lastly a more challenging one
3.) m = y2 - y1 over x2 - x1, for y2
+6251 \(a x + z = a w + y \\ a x - a w =y - z \\ a(x-w)= y-z \\ \mbox{assuming }x \neq w \\ a=\dfrac{y-z}{x-w}\)
\(q = p(r+s) \\ q = p r + p s\\ q -p s = p r \\ \mbox{assuming }p\neq 0 \\ r = \dfrac {q - ps}{p}\)
\(m = \dfrac{y_2-y_1}{x_2-x_1} \\ m(x_2-x_1) = y_2-y_1 \\ y_2 = m(x_2-x_1)+y_1\)
.
