The graph of y = x + 1 is a straight line with slope 1 which passes through the point (0, 1)
If you have y < x + 1, then it is the area under the line y = x + 1 and is shown by shading the area under the line.
If you have y > x + 1, then it is the area above the line y = x + 1 and is shown by shading the area above the line.
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This is known as the Cosine Rule.
The y value will equal 15, when x = 7
x+0=y x means any number plus 0 equals y which is the answer
There's a rule?
rule, table of values and graph