Well, if 3x equals 12, then x equals 4. And if y equals 3x, then y equals 3 times 4, which is 12. So, y equals 12. Math can be a piece of cake when you break it down like that!
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y-3x+6y=12 7y=3x+12 y=3x/7 +12/7
15
3x + 2y = 12 ie 2y = 12 - 3x so y = 6 - 3x/2
3x + y = 12The x intercept occurs when y = 0. Then, 3x + 0 = 12 : 3x = 12 : x = 4The y intercept occurs when x = 0. Then, (3 x 0) + y = 12 : y = 12.