How do i graph the equation 7x-4y-28=0?

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Oddman answered
You graph it the way you graph any equation. You find some values of (x, y) that satisfy the equation, plot them, and draw an appropriate curve (line) through them.

I find it convenient to put these equations into intercept form. You do that by dividing by the constant (after putting the equation in standard form). Then, you express the x and y coefficients as denominators.
  7x - 4y = 28    (your equation in standard form)
  7x/28 - 4y/28 = 1    (divide by the constant 28)
  x/4 + y/-7 = 1    (now, we have it in intercept form)
This tells us that two points are
  (4, 0) and (0, -7)
We can plot these, draw the line, and we have our graph.

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