What is 6x+9y=28 X=6
So 6x+9y=28 when x=6, so we replace x with 6. And when two numbers are close to each other you have to multyply. 6*6+9y=28, 6*6= 36 ; 36+9y=28. But if you want to backtrack it, it will be hard...
What is 6x+9y = 28, x=6
6(6) + 9y = 28
36 + 9y = 28 subtract 36 from both sides
9y = −8 divide both sides by 9
y = − 8/9 when x = 6
+83 
