Solve each system by substitution. (3x+2y=23, 1/2x-4=y), (4x=3y-2, 18=3x+y), (4y+3=3y+x, 2x+4y=18), (4y-x=5+2y, 3x+7y=24)

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults. how many students and adults went if the ticket charge was $42.75

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy