Question 1183263
9x + 6y = 90
solve for y to get:
y = 15 - 1.5x


since y = 1.5 * x, and since y has to be an integer, then:
x has to be an even number from 2 to 8.


when that happens, y will be equal to 15 - 1.5 * x.


your solutions are shown in the following graph.


<img src = "http://theo.x10hosting.com/2021/072501.jpg" >


the coordinate points are in (x,y) format.


for example, (2,12) means the value of y is 12 when the value of x is 2.


the eqution is 9x + 6y = 90
then y = 12 and x = 2, the equation becomes:
9*2 + 6*9 = 90 which becomes:
18 + 72 = 90 which becomes:
90 = 90, confirmirming those value pairs are correct.