3+10 = 13
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Multiply the first equation by 3 to give 9x + 15y = 21
8x + 3 = 50 8x = 47x = 47/8x= 5 and 7/8ths
I believe the converse is: if 2x equals 6 then x equals 3 inverse: if x doesn't equal 3 then 2x doesn't equal 6 contrapositive: if 2x doesn't equal 6 then x doesn't equal 3
7x + 8 = 10x - 2 ∴ 3x = 10 ∴ x = 10/3
2x + 4 = 10 2x = 10 - 4 = 6 2x = 6 x = 6/2 = 3