Answer:
C) 
Step-by-step explanation:

<span>1. Make y the subject
a) 4y=12x+18
y = 3x + 4.5
b) 2x=7-3y
3y = -2x + 7
y = -2/3x + 7/3
2.
a) what is the equation of the line which passes through both (-2,-4) and (6,16)
slope = (16 + 4)/(6 +2) = 20/8 = 2.5
y = mx + b
-4 =2.5(-2) +b
-4 = -5 +b
b = 1
equation
y = 2.5x + 1
b) what is the equation of the line perpendicular to y= 1/2X + 7 passing through point (3,9)
</span>y= 1/2X + 7
slope = 1/2
slope of line perpendicular = -2
passing through point (3,9)
y = mx + b
9 = -2 (3) + b
b = 15
equation
y = -2x + 15
No, if you are subtracting a bigger than the one it is being taken from then the answer will be negative. Ex:5-10=-5
Hope this helps:)
Answer:
3n² + 4n - n
3 x 7² + 4 x 7 - 7
first do the exponent because there is no parentheses
3 x 49 + 4 x 7 - 7
second do either multiplication or division with ever is closes to the left
147 + 4 x 7 - 7
147 + 28 - 7
third do either addition or subtraction which ever is closes to the left
175 -7
168
finally the answer is 168
Raymond bought 9 rolls because you divide 3 and 4 to get 0.75 and multiply it by 12 to get 9 rolls