Use substitution to solve the system of equations. -1=2x-y 8x-4y=-4
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The formula 
means that from statement q implies statement p.
When statements p="two linear functions have different coefficients of x" and q="the graphs of two functions intersect at exactly one point", then the statement have a form: "If the graphs of two functions intersect at exactly one point, then two linear functions have different coefficients of x."
When statements p="two linear functions have different coefficients of x" and q="the graphs of two functions intersect at exactly one point", then the statement