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Slope-intercept you have right:
y=3/4x-7
Point slope form is:
y − y1 = m(x − x1)
so
y +7 = 3/4(x -0)
or
y + 7 = 3/4x
G = m/5t- Q^2. Hope that helps.
Less than is subtraction so your answer to "six less than a number is 14" would be
n-6=14