Question 1106720
1)  we can use the equation y = 3x + 1 to find the y coordinate of the intersection point
y = 3(1) + 1
y = 4
then use equation y = 2x + b to find the value of b
4 = 2(1) + b
b = 2
here is the graph of y = 3x + 1(red line), y = 2x + 2(green line
{{{ graph( 300, 200, -10, 10, -10, 10, 3x+1, 2x+2) }}}
:
2) use y = -2x - 3 to find the y coordinate of the intersection point
y = -2(-1) - 3 = -1
then use y = mx - 4 to find the value of m
-1 = m(-1) - 4
-m = 3
m = -3
here is the graph of y = -2x - 3(red line), y = -3x - 4(green line
{{{ graph( 300, 200, -10, 10, -10, 10, -2x-3, -3x-4) }}}
: