You cannot solve one linear equation with two unknown variables.
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-7x+9y = 54 9y = 7x+54 y = 7/9x+6 which is now in slope-intercept form
(1, -1)
7x + 2 = 5,6
Subtract by 7x and divide by 2.
7x+2-2=16-27x = 147x/7 = 14/7x = 2