Answer:
12.2
Step-by-step explanation:
12 okay so 5 tens shaded 7 dhaded
8/20 and 12/30 are equivalent to 4/10.
You just have to multiply the numerator and denominator by the same number.
Hope it helps.
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x=-2 is your anwser for this problem
7x - 3y = 4 => 7x = 3y + 4 => x = (3y + 4) / 7 2x - 4y = 1 => 2x = 4y + 1 => x = (4y + 1) / 2
=> (3y + 4) / 7 = (4y + 1) / 2 (3y + 4) * 2 = (4y +1) * 7 6y + 8 = 28y + 7 22y = 1 Y = 1/22 =>you can substitute y for the system of equations and find x