30 POINTS!! Please help me!

3) no solutions

4a) x=-9 and y=-3 or (-9,-3)

4b) x=4 and y=-6 or (4,-6)

4c)  x=13 and y=-9 or (13,-9)

Step-by-step explanation:

For #3, both expressions are equal to y, so we set them equal to each other and solve:

-x+4=-x+2

-x=-x-2

0=-2

Looks like number 3 has no solution. You can also tell they have no solution because both expressions have the same slope but different y-intercept, meaning they'll never intersect.

For #4a, we already have the value of x, so we plug in to the top equation and solve for y then get x from y:

2y+3y=-15

5y=-15

y=-3

Since x=3y, then x=3(-3) which is x=-9. So your answer is x=-9 and y=-3 or (-9,-3) as an ordered pair.

For #4b, we can use elimination to cancel the "y"s out and solve for x then use that to get y:

5x=20

x=4

Since 2x+y=2, then 2(4)+y=2 which is 8+y=2 which is y=-6. So your answer is x=4 and y=-6 or (4,-6) as an ordered pair.

For #4c, we can use elimination to cancel the "5x"s out and solve for y then use that to get x:

4y=-36

y=-9

Since 5x+7y=2, then 5x+7(-9)=2 which is 5x-63=2 which is 5x=65 which is x=13. So your answer is x=13 and y=-9 or (13,-9) as an ordered pair.

t = 3

step-by-step explanation:

put t = 3 in this expression :

(3²-1)(3²-2)(3² - 3)(3² - 4) = 8×7×6×5 = 56×30 = 1680