The awnser is 17.5 Your welcome.
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4x+4y=-9
first change into yintercept form
y=-x-9/4
to find yintercept let x=0
y=-0-9/4
y=-9/4 or -2.25
to find xintercept let y=0
0=-x-9/4
x=-9/4
so the x and y coordinates are -2.25 and -2.25 respectively
The greatest common factor 16 and 9 is one.
The factors of 16 are 1, 2, 4, 8, 16.
The factors of 9 are 1, 3, 9.
The only factor common to both is 1.