Question

0.3x-0.2y=4
0.5x+0.5y+=85/19
solve by elimination method

Answer 1

Multiply the first equation by 0.5 and the second equation by 0.2 and you get:

0.15x-0.1y=2=38/19 Use 38/19 because of the second equation
0.1x+0.1y=17/19

Add both equations and you get:

0.25x=55/19 0.25=1/4
(1/4)x=55/19
x=(55)(4)/19
x=220/19

Substitute x=220/19 into one of the equations and you get:

0.5x+0.5y=85/19
0.5(220/19)+0.5y=85/19
110/19+0.5y=85/19
0.5y=(85/19)-(110/19)
0.5y=-25/19 0.5=1/2
(1/2)y=-25/19
y=(-25/19)(2)
y=-50/19

Therefore, x=220/19 and y=-50/19

Answer 2

\[2x-3/8\le-5 or 2x-3/8\ge5\]

Answer 3

\[\sqrt[4]{64x ^{12}}y ^{14}\] simplify by factoring assume that all expressions under the redical represent nonegative numbers needs an exact anser use radicals if needed