Question

What is the value of the function y=2x+3 when x = –1?

A.
5

B.
–5

C.
2

D.
1

Answer 1

\(\large\color{slate}{ y=2x+3 }\)

~~~~~~~~~~~~~~~~~~~~~~~~~
when x=3, then
\(\large\color{slate}{ y=2x+3 }\)
\(\large\color{slate}{ y=2(3)+3 }\)
\(\large\color{slate}{ y=6+3 }\)
\(\large\color{blue}{ y=9 }\)
~~~~~~~~~~~~~~~~~~~~~~~~~
when x=0, then
\(\large\color{slate}{ y=2x+3 }\)
\(\large\color{slate}{ y=2(0)+3 }\)
\(\large\color{slate}{ y=0+3 }\)
\(\large\color{blue}{ y=3 }\)
~~~~~~~~~~~~~~~~~~~~~~~~~
when x=-2, then
\(\large\color{slate}{ y=2x+3 }\)
\(\large\color{slate}{ y=2(-2)+3 }\)
\(\large\color{slate}{ y=-4+3 }\)
\(\large\color{blue}{ y=-1 }\)

can you tell me what is it, when x=-1?