Asked by ellize
xy = 12
y = 2x + 2
y = 2x + 2
Answers
Answered by
MathMate
xy = 12 ....(1)
y = 2x + 2 ....(2)
Substitute (2) into (1) to get:
x(2x+2) = 12
simplify and solve for the quadratic in x.
y = 2x + 2 ....(2)
Substitute (2) into (1) to get:
x(2x+2) = 12
simplify and solve for the quadratic in x.
Answered by
jai
substitute the first equation to the second:
x(2x + 2) = 12
2x^2 + 2x - 12 = 0
x^2 + x - 6 = 0
(x+3)(x-2)=0
x = -3 and x = 2
substitute x values to either equations and solve for y:
first equation:
if x = -3,
(-3)y = 12
y = -4
if x = 2,
(2)y = 12
y = 6
so there,, =)
x(2x + 2) = 12
2x^2 + 2x - 12 = 0
x^2 + x - 6 = 0
(x+3)(x-2)=0
x = -3 and x = 2
substitute x values to either equations and solve for y:
first equation:
if x = -3,
(-3)y = 12
y = -4
if x = 2,
(2)y = 12
y = 6
so there,, =)
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