Answer:(3,0)
Explanation:To find the x substitute 0 in for y,7x+3*0=21.Next,multiply 3 and 0,and that gives you 0,7x+0=21 .After you do that you need remove 0 because when you add and subtract zero the quantity doesn’t change,7x=21.Lastly,divid both sides of the equation by 7,and that gives you x=3.
Answer:
Therefore,
There are Four i.e 4 terms in the expression,

Step-by-step explanation:
Algebraic Expression:
An algebraic expression is a mathematical expression that consists of variables, numbers and operations.
- Variables with the coefficient is called as Term.
- Number is also a term.
Here the Expression is

So,

In all there are Four i.e 4 terms in the given expressions.
Therefore,
There are Four i.e 4 terms in the expression,

Simplified it is 4k = -14
Step-by-step explanation:
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