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Name ________________________________________ Algebra - Pd ____ Date _____________ Systems of Equations Review Solve the following using substitution: 1) x + 3y = 4 2x - y = 1 2) 2x - y = -1 y=x-1 3) y = 3x + 5 12x - 7y = 1 Solve the following using elimination: 4) 13x - 3y = 78 4x + 6y = -66 5) -7y + 3x = 42 5y + 2x = 57 6) -8x + 5y = 97 10x = -7y + 51 Solve the following using either method: 7) 2x = y + 9 6x + 3y = 15 8) 4x - 6y = 15 6x - 4y = 10 9) y = 3x + 4 8x - 9y = -139 10) 45 is what percent of 720? 11) 165 is 35% of what number? x 4 5x 4 2 x 8 3x 9 12) 13) 3 18 4 3 14) Jill had $300 in the bank. She then deposited $15. This represents what percent of her original amount 15) In a school 60 students are in the band. This represents 12% of the students body. How many students are not in the band? 16) In a class of 560 students 85% of the students watched the Superbowl. How many students did not watch the game? 14) An angle whose measure is 120° is divided into three parts that are in a ratio of 2:3:7. Find the number of degrees in each angle. 15) Of the 126 students in the 8th grade, the ratio of boys to girls is 4:5. How many girls are in the 8th grade? 16) Two numbers have the ratio 7:5. Their difference is 12, find the two numbers.