x will represent the first unknow number
6x will represent the second number
the two numbers together will equal 21
6x + x = 21 combine like terms
7x =21 divide both sides by 7
x =3
Hope that helps.
brainliest is always appreciated.
Answer:

Step-by-step explanation:
square 18 and square 35 then add together
Answer:
the answer is -77/8 or -9.625
Step-by-step explanation:
Answer:
2(x+8)
If you want the second step this is it: 2x+16
x=variable
Step-by-step explanation: