Question

if (a,7) is one of the solutions of equation 3x+2y=41 , then a=9​

Answer 1

Answer:

a=9

Step-by-step explanation:

It means x=9

then why? (a, 7) is a point of a graph.

What does a point of a graph look like? (x,y), then this point give us the "y"

y is 7 so we replaced 7 instead of y:

3x+2(7)=41, then multiply 2 by 7.

3x+14=41, after that -14 on both sides and we get this:

3x=27, we can divide both sides by 3.

x=9