Question

Find the solution of the equation on graphically 7r-15= r+27

Answer 1

6r=42
r=7
The final answer is 7

Answer 2

r = 7

Explanation:

let r = x

equation becomes

7x-15= x+27

Let the Left side AND Right side both equal y

y = 7x - 5

y = x + 27

graph these 2 equations. You should get 2 straight lines that intersect at x = 7, y = 34. (see attached)

recall at the start we let r = x, if we replace x with r again, we get r = 7