y = x² - 4
y = 2x + b
In the xy-plane above, two graphs intersect at two points. What is the value of b?
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Answer:When the graphs of y = f(x) and y = g(x) intersect , both graphs have exactly the same x and y values. ... Calculate the point of intersection of the two lines f(x) = 2x − 1 and g(x) = x + 1. ... Solve the equation x2 − 2x − 3 = 2x − 3 first graphically, then algebraically. ... We use the quadratic formula with a = 1, b = −2 and c = 2.
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