I’m guessing you mean like this.
2x+4y+5x+8y.
2x and 5x are like terms because the x’s are alike. If you add 2+5, the answer is 7. So therefore 2x+5x=7x.
4y and 8y are like terms because the y’s are alike. So the answer to 4y+8y would be 12y.
If you need extra help, give me a problem and I will help you solve it.
Answer:
The value of variable a is 12.5.
Step-by-step explanation:
4 is to 5 as 10 is to a.
or, 4 : 5 = 10 : a
By the RATIO OF PROPORTIONALITY:
or, the value of a = 12. 5
⇒ 4 is to 5 as 10 is to 12.5
Hence, the value of variable a is 12.5.