Answer:
1.) 7x + 4y when x=6 and y=8
Answer: 74
2.) 8x + 6y when x=9 and y=5
Answer: 102
3.) 16a - 9b when a=2 and b=5
Answer: -13
4.) 14a - 5b when a=5 and b=9
Answer: 25
5.) 4x + 7y + 3xy when x=3 and y=7
Answer: 124
6.) [tex]\frac{n}{4} +\frac{60}{n} -\frac{n}{6}[/tex] when n=12
Answer: 6
7.) [tex]\frac{54}{n} +\frac{n}{3}[/tex] when n=9
Answer: 9
8.) 9xy - 4xz + 3yz when x=8, y=5 and z=7
Answer: 241
9.) 14xz + 6y - 4yx when x=7, y=3 and z=2
Answer: 346
10.) x + 8y + 5xy when x=12 and y=3
Answer: 216
11.) [tex]\frac{(y+16)}{6} +\frac{(50-y)}{3}[/tex] when y=8
Answer: 18
12.) [tex]\frac{(w+57)}{9} +\frac{(90+w)}{7}[/tex] when w=6
Answer: 20.71
13.) (x + y) (x - y) when x=8 and y=3
Answer: 55
14.) (x + 2y) (2x - y) when x=7 and y=4
Answer: 150
15.) 81 - 2 [ 5 (n + 4)] when n=3
Answer: 21
Step-by-step explanation:
This is how I solved the items:
Example:
7x + 4y when x=6 and y=8
Step 1: SUBSTITUTE
So,
7 (6) + 4 (8)
Step 2: MULTIPLICATION
So,
7 x 6 = 42
4 x 8 = 32
42 + 32 = ?
Step 3: SOLVE
42 + 32 = 74
There you have the answer.
See the pic above/below for more examples...
