Question

1. Write the answer in the form (x, y) 2.Write the answer in the form (x, y, z). 3. explain the answer to the inequality. 4. best explain question four by simplify.

Answer 1

3x-4y=5
-x+2y=3
multiply bottom equaiton by 2 and add to top one
3x-4y=5
-2x+4y=6 +
x+0y=11
x=11
sub back
-11+2y=3
add 1 to bth sides
2y=14
divide 2
y=7
(11,7)


2. this requires lots of work
(3,0,-1)

3.
minus 6 from everybody
-10≤-2x≤7
divide everybody by -2, don't forget to flip sign
5≥x≥-3.5

-3.5≤x≤5



4.
√48=√(2*2*2*2*3)=√(16*3)=(√16)(√3)=4√3

Answer 2

1.) 3x - 4y = -5 . . . (1)
-x + 2y = 3 . . . (2)
Make the coeficient of one of the variables equal. We make the coeficient of y equal by multiplying (2) by 2.
(2) x 2 => -2x + 4y = 6 . . . (3)
Eliminate the variable by subtracting (if the signs are the same) or adding (if they have different signs), here the coefitient of y in (1) and (3) are the same but have different signs, so we add.
(1) + (3) => x = 1
Substituting x = 1 into any ot the equations gives you the value of y, we substitute into equation (2).
-1 + 2y = 3
2y = 3 + 1 = 4
y = 4/2 = 2
Writing the answer in the form of (x, y), we have (1, 2).