<em />If both the matching coefficients are the same, we subtract equation 2 from equation 1
2b - 3b = -b $220 - $268 = $-48 -b = -$48 b = $48
If you want to find out what a unicycle costs... Substitute b = $48 into the first equation 2u + $48 = $110 Balance the equation, whatever happens on one side, happens on the other. 2u + $48 (-$48) = $110 (-$48) 2u = $62 2u(/2) = $62(/2) u = $31
-10=10(k-9) so, -10=10k-90 that is just expanding the brackets by multiplying to k and-9 then. -10=10k-90 move the-90 over by adding 90 so, 80=10k k =80/10 k=8
