1 + 4x + x = 21
Combine the like-terms on the left:
1 + 5x = 21
Subtract 1 from each side:
5x = 20
Divide each side by 5:
x = 4
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The answer to the problem of 13 equals -4x plus 9 is x equals -1.
The answer is the number that ' x ' must be.4x + 1 = 21Subtract 1 from each side of the equation:4x = 20Divide each side by 4:x = 5
x-intercept of y equals -4x plus 4 y = -4x + 4 0 = -4x + 4 -4 = -4x 1 = x So 1 is the x-intercept