The answer is 79.
Since you know the values of x and y, you can simply substitute them into the equation to find the answer.
x = 6
y = 7
5x + 7y
= 5(6) + 7(7)
= 30 +49
= 79
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Slope is found by this form. Y = mX + c ( m = slope ) - 5X - 7Y - 6 = 0 ( I assume this is what you mean ) - 7Y - 6 = 5X - 7Y = 5X + 6 Y = - 5/7X - 6/7 The slope would be in this instance, - 5/7 ----------
8x-7 plus 2x equals 6 plus 5x plus 2?
8x + 5x + 2x + 4x = 114 19x = 114 x = 6 then 5x + 3 = 5*6 + 3 = 33
5x + 6 = -44 ⇒ 5x = -50 (subtract 6 from both sides) ⇒ x = -10 (divide both side by 5)
6-3x = 5x-10x+10 6-3x = -5x+10 -3x+5x = 10-6 2x = 4 x = 2