If the point (a,3) lies on the graph of the equation 5x + y = 8, then a= A) 1 B) -1 C) 7

asked Mar 8, 2016 140k views

5 votes

If the point (a,3) lies on the graph of the equation 5x + y = 8, then a=

A) 1
B) -1
C) 7

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7 votes

$5a+3=8\\ 5a=5\\ a=1\Rightarrow A$

Tobyb answered Mar 11, 2016

by Tobyb

8.6k points

4 votes

$(a,3) \\ x=a \\ y=3 \\ \Downarrow \hbox{plug the values into the equation} \\ 5a+3=8 \ \ \ |-3 \\ 5a=5 \ \ \ |/ 5 \\ \boxed{a=1} \Leftarrow A$

Ayyash answered Mar 14, 2016

8.3k points

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