Mathematics
7 Online
OpenStudy (anonymous):
...
Join the QuestionCove community and study together with friends!
Sign Up
OpenStudy (helder_edwin):
can u find the slope of the line in your graph?
OpenStudy (helder_edwin):
the intercepts are (-8,0) and (0,-4) so the slope is
\[ \large m=\frac{0+4}{-8-0}=\frac{4}{-8}=-\frac{1}{2} \]
OpenStudy (helder_edwin):
so the line in the graph is
\[ \large y-0=-\frac{1}{2}(x+8) \]
OpenStudy (helder_edwin):
which can be rewritten as
\[ \large 2y=-x-8 \]
or
\[ \large x+2y=-8 \]
OpenStudy (helder_edwin):
do u see the origin (0,0) is in the shaded area?
Join the QuestionCove community and study together with friends!
Sign Up
OpenStudy (helder_edwin):
if we replace (x,y)=(0,0) then we have
\[ \large 0+2\cdot0=0>-8 \]
OpenStudy (helder_edwin):
then the shaded area is
\[ \large x+2y>-8 \]
or
\[ \large 2x+4y>-16 \]
(after multiplying by 2, the last inequality)
OpenStudy (helder_edwin):
it looks like that (u have a typo).
OpenStudy (helder_edwin):
D has no sign > or <
OpenStudy (helder_edwin):
then, it is D
Join the QuestionCove community and study together with friends!
Sign Up
OpenStudy (helder_edwin):
no sign > or < or >= or <=
OpenStudy (helder_edwin):
\[ \large y?2x+6 \]
OpenStudy (helder_edwin):
<= solid line
OpenStudy (helder_edwin):
\[ \large y\leq2x+6 \]
\[ \large -2x+y\leq6 \]
if (x,y)=(0,0) then
\[ \large -2\cdot0+0\leq6 \]
is true
OpenStudy (helder_edwin):
D
Join the QuestionCove community and study together with friends!
Sign Up
OpenStudy (helder_edwin):
gotta go. bye. good luck