4x
2
4x + y = 9 so that y = 9 - 4x 7x - 8y = 6 7x - 8*(9-4x) = 6 7x - 72 + 32x = 6 39x = 78 x = 2 Then y = 9 - 4x = 9-4*2 = 9-8 = 1
(2, 1)
4x + 2(3x) = 30 10x = 30 x= 3. Y= 9. (3,9)
4x
99
4x + 3y=9 x=0 y=3
2
x = 9 and y = 28
4x + y = 9 so that y = 9 - 4x 7x - 8y = 6 7x - 8*(9-4x) = 6 7x - 72 + 32x = 6 39x = 78 x = 2 Then y = 9 - 4x = 9-4*2 = 9-8 = 1
(2, 1)
y = 4x-3
4x + 2(3x) = 30 10x = 30 x= 3. Y= 9. (3,9)
It is: y = -4x+12
y+6=4x-3 y=4x-9 This is the slope intercept form: y=mx+b m (slope) = 4
2x-y=5, y=2x-5 4x+y=4, y=4-4x 2x-5=4-4x 6x=9 x=3/2 y= 2(3/2)-5 y=-2