It is then 2y
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x + y = -1 (a) 4x - 3y = 12 (b) 3(a)+(b) gives 3x + 3y + 4x - 3y = -3 + 12 or 7x = 9 or x = 9/7 then x + y = -1 gives y = -1 -x = -1 - 9/7 = -16/7 So, x = 9/7 and y = -16/7
2x+3y=13 3x-y=3 x=2
The y-intercept is -5. 2x - 3y = 15 -3y = -2x + 15 y = 2/3x - 5 the y-intercept is the number in slope intercept form that does not have a variable, the minus sign makes the intercept negative.
(3y2 - 3y)/(y - 1) = 3y(y - 1)/(y - 1) = 3y
if: r = 5z 15z = 3y then: z = y/5 r = 5(y/5) r = y