Answer:

Step-by-step explanation:
<u>Step 1: Set x to 4 and set y to -5</u>
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Answer: 
Answer:
70
+30x-140
Step-by-step explanation:
(7x+3) (10x-14)
70
-98+30x-42
70
+30x-42-98
70
+30x-140
Answer:
1/4
Step-by-step explanation:
Distribute.
7 - 7y = -3y + 6
Get all ys on one side
7 = 4y + 6
Get constants all on one side.
1 = 4y
Divide
1/4 = y
Take the 5 in 15 and multiply it by 2. Write it. Then take the 5 and multiply it by 1. Write it. On the next line write a zero and then take the 1 multiplied by 2 and then 1 times 1. Here is an example... it's a little complicated to explain but here...
12
15
----
60
120
-------
180
So sorry I can't explain things well...