So you subtitute y=3x into
2x+y=15
so
2x+(3x)=15
add like terms
5x=15
divide both sides by 5
x=3
subtitute x=3 into first equation (y=3x)
y=3(3)
y=9
Answer:
-13 is less than zero in the options
6(3r^2 - 4r + 7)
18r^2 - 24r + 42
Letter A
x² + y² – 10x + 6y + 18 = 0
x² – 10x + y² + 6y + 18 = 0
x² – 10x + 25 - 25 + y² + 6y + 9 - 9 + 18 = 0
(x-5)² + (y+3)² -16 = 0
(x-5)² + (y+3)² = 16
(x-5)² + (y+3)² = 4²
Center at (5,-3) radius = 4
Part 2
1. Complete the square for x and y
2. Put in the format for a circle. (x-h)² + (y-k)² = r², center at (h,k) with radius = r
