15. -(-7y + 12) = 7y - 12
16. 1/a = 16/18
cross multiply
16a = 18
a = 18/16 = 9/8
17. 8x - 12 = 4x + 24
8x - 4x = 24 + 12
4x = 36
x = 36/4
x = 9
18. -6b > 42 4b > -4
b < 42/-6 b > -4/4
b < - 7 b > -1
so b < -7 and b > -1
19. 6 more then the product of 8 and n
6 + 8n
20. 45 = 3b + 69
45 - 69 = 3b
-24 = 3b
-24/3 = b
-8 = b
Y = 3x - 2
I assume this is what they mean;
3(1)- 2 = 1 for <span><span>x = 1
</span>Fill in the x's with the following numbers. so first... (x = 2)
</span>y = 3x - 2
3(2) - 2
multiply 3 and 2 and then minus 2
which equals 4 all together
y=4
therefore;
3(2) - 2 = 4
For x = 3
Fill in the x with 3 in the equation
3x - 2 = y
3(3) - 2 = y
9 - 2 = y
equals 7
so...
3(3) - 2 = 7
Do the same rule with number 4 :)
Let me know if it's different from what you're learning
23.99 multiplied by .44, you'll get the product of that. Take that product and subtract it from 23.99 and you'll get your answer
23.99 x .44 = 10.5556
23.99 - 10.5556 = 13.43 <span />