You have to only add the values
12.6
3.1
+ 5.4
= 21.1
so 21.1 > 20
Blue:
y-intercept: (0, 4)
a slope: m = -1/2
The equation: y = -1/2x + 4 |·2
2y = -x + 8 |+x
x + 2y = 8
Red:
y-intercept: (0, 3)
the slope: m = -1/2
The equation: y = -1/2x + 3 |·2
2y = -x + 6 |+x
x + 2y = 6 |·2
2x + 4y = 12
Answer:
x + 2y = 8
2x + 4y = 12