6 + 7x = -36
first, subtract 6 from both sides
7x = -42
then, divide both sides by 7
7x/7 = -42/7
x = -6
to check, put -6 back into the original equation:
6 + (7 x -6) = -36
6 - 42 = -36
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x2 + 7x = 2x2 + 6 x2 - 2x2 + 7x = 6 -x2 +7x - 6 = 0 or alternatively x2 - 7x + 6 = 0
9x+6 = 7x+18 9x-7x = 18-6 2x = 12 x = 6
x=6
i got 42 divided 7x
7x + y = 6 y = 6 - 7x dy/dx = 0-7 = -7 Slope = -7