y-intercept = 3
y-intercept ; x = 0
7y + 3x - 21 = 0
7y + 3(0) -21 = 0
7y -21 = 0
7y = 21
7y/7 = 21/7
y=3
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If: 4x-7y-28 = 0 then y = 4/7x-4 whereas 4/7 is the slope and -4 is the y intercept
If you mean: 32-10x+7y = 0 then as a straight line equation it is 7y = 10x-32
Will try elimination here.2X - 7Y = 0- 2(X - 6Y = - 5)2X - 7Y = 0- 2X + 12Y = 10------------------------------add5Y = 10Y = 2---------- find X ( second equation will do )X - 6(2) = - 5X - 12 = - 5X = 7-------------check both equations for consistancy2(7) - 7(2) = 014 - 14 = 00 = 0----------------first equation checks7 - 6(2) = - 57 - 12 = - 5- 5 = - 5---------------------------both check and are consistent(7, 2)------------------ordered pair
Points: (7, 0) and (0, 11) Slope: 0-11/7-0 = -11/7 Equation: y-0 = -11/7(x-7) => 7y = -11x+77 Equation: y-11 = -11/7(x-0) => 7y = -11x+77
Without the inclusion of an equality sign or whether it is -210 rather than -21 0 it can't be answered. But if you meant: 7y = 3x-210 then y = 3/7x-30 where then the slope is 3/7 and the y intercept is -30