Question 391526
I need help understanding and graphing the equation to find the y-intercept
y+x=-7
You need to put the equation into the slope/intercept form (y = mx + b)
where m is the slope and b is the y intercept (occurs when x=0)
y + x = -7
subtract x from both sides and you have
y = -x - 7, slope in this case m=-1
:
Choose at least two values for x, and find y
Let x = -3
y = -(-3) - 7
y = 3 - 7; minus a minus is a plus
y = -4 
plot the ordered pair, x=-3, y=-4
and
Let x = +2
y = -2 - 7
y = -9
plot the ordered pair, x=2; y=-9
:
Join these two points with a straight line
the graph should look like this
{{{ graph( 300, 200, -8, 6, -10, 10, -x-7) }}}
You can see the y intercept = -7, when x = 0