Answer:
7. 17
8. -7
9. 64/3 or 21 1/3
Explanation:
7. 3x-4 and the value of x is 7. Plug 7 into the x values in the expression that is given.
3x-4 --> 3(7) - 4
When simplified, 3(7) - 4 becomes 21-4 which is 17.
8. -5x+8 and the value of x is 3. Same as before, but this time you'll plug 3 into the x values in the given expression.
-5x+8 --> -5(3) + 8
When simplified, -5(3) + 8 becomes -15+8 which is -7.
9. 10x+18 and the value of x is 1/3. Plug in 1/3 into the x values in the expression.
10x+18 --> 10(1/3)+18
When simplified, 10(1/3)+18 becomes 10/3+18. To solve this, turn 18 in a fraction over 3. 3x18=54 and that gives you the numerator. 10/3+54/3= 64/3. If you wanted it in a mixed fraction, it would be 21 1/3.