First, we need to figure out a linear equation. When given two points - and - first subtract from and and from . So in your situation, it will be and . That equals and , so your slope (how much the line moves up/down per unit) will be .
Next, we need to find the y-intercept. To solve using point-slope form, we will plug our numbers in:
So our final equation is , which passes through both and . Hope this helps :)
Yes because you multiply first so in this case you multiply 7 and 3 first. Since the second expression is in parenthesis you do that first just like you do 7 times 3. Then you just add 2 to that. The value of both expressions is 23