so elimination
I assume that you meant to write
9x+5y=28 and not 9x+5=28
so
elimination is basically eliminating values
9x+5y=28
-3x-10y=-26
we can either cancel out the x terms or the y terms, I will cancel out the y terms
9x+5y=28
multipy both sides by 2
18x+10y=56
add to other equation
18x+10y=56
-3x-10y=-26 +
15x+0y=30
15x=30
divide both sides by 15
x=2
subsitute
9x+5y=28
9(2)+5y=28
18+5y=28
subtract 10 from both sides
5y=10
divide both sides by 5
y=2
x=2
y=2