0
You cannot solve it with two unknown values 'x' & 'y' .
However, it can be rearranged to form a strasight line eq'n.
Hence
-3x -3y = -15
Cancel down by '3'
Hence
-x -y = -5
Multiply by '-1',
Hence
x + y = 5
Hence
y = -x + 5 Is the straight line eq'n.
It has a slope/gradient of '-1' ; the coefficient of 'x'
It intercepts the y-axis at '5'. ; ( 0,5)
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