10a. y= 35x + 60
10b. $165
2x+3y=17 --- 1
3x+6y=30 --- 2
x+2y=10
x=10-2y --- 3
Sub 3 into 1,
2(10-2y)+3y=17
20-4y+3y-17=0
3-y=0
y=3 --- 4
Sub 4 into 3,
x=10-2(3)
x=4
Therefore, Answer is (4,3).
8-2 = 6 per plate profit
6x
they spent 150 so it would be -150
6x - 150 = 2400
X=-9
There is no slope in either equation. Therefore, x=-11 and x=-9 will be two vertical and parallel lines at (-11,0) and (-9,0)
