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Q: What type of lines are these x plus 2y equals 7 and 2x plus 4y equals 21?

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x = 3, y = 3

143542make the variables X plus Y plus Zthe solution is X*Y,X*Z, then (X+Z)*Y flipped7*2=147*5=35(7+5)*2=24 flipped =421435425*3=155*2=10(5+2)*3=21...flipped =12151012

2x-3=10x+21 2x-3-2x=10x+21-2x -3=8x+21 -3-21=8x+21-21 -24=8x -3=x

5p-1=2p-20 3p=21 p=7

x2 + 8x - 5 = 0 ∴ x2 + 8x + 16 = 21 ∴ (x + 4)2 = 21 ∴ x + 4 = ± √21 ∴ x = -4 ± √21

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The mathematical statement 31 plus 21 equals 52 as a total.

21+21+19+19=80

12 plus 9 equals 21.

The statement 10 plus 21 equals 31 in total. It can also be written as 10 + 21 = 31.

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273 13+8 = 21 and 13*21 = 273

The answer is 21 because if 21 is divided by 3 it equals 7 plus 4 equals 11.

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21 + 10 = 31

21

21

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