exam Maths Puzzle Numerical Ability

how would you write this standard form of a linear equation into slope intercept form?
-6x+7y=21. slope-intercept form is y=mx+b. so do you just plug the numbers in? would -6x+7y=21 in slope-intercept form be: y=-6x+21??

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exam Other Question

painting is 10 inch tall and 15 in. wide. A print of the painting is 25 inch tall, how wide is the print.
16 2/3 in., 30 inch, 37 1/2 inch, 40 inch, 0r 60inch. ---answers

I said 37 1/2, is this right? I need help. For the following problem I found no solution:

2log2 (x+6) - log2 16 = 2

heres my work:
log2 x^2+36-16 = 2
x^2+20 = 2^2
x^2+20 = 4
x^2=-16
then there is no real number for the square root of -16