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Sauron [17]
3 years ago
9

SOLVE THE SYSTEM OF EQUATIONS USING ELIMINATION.The equation is 4x+y=-5 and -2x+2y=6 (show work pls )

Mathematics
1 answer:
taurus [48]3 years ago
4 0

Answer:

y=1.4

x=-1.6

Step-by-step explanation:

Hi, to solve this system of equations we have to multiply the second equation by 2, and then subtract the first equation to the second one:

4x+y=-5  

-2x+2y=6

-4x+4y=12

+

4x+y=-5

__________

5y =7

y = 7/5 = 1.4

Replacing y=1.4 on any equation:

4x+1.4=-5

4x = -5-1.4

4x= -6.4

x=-6.4/4

x=-1.6

Feel free to ask for more if needed or if you did not understand something.

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−6x + 14 < −28 OR 9x + 15 ≤ −12. solve for x.
sasho [114]

Answer:

x>7 or x ≤ -3

Step-by-step explanation:

Solving the 1st inequality

-6x +14 < -28 --------------- (Collect like terms)

-6x < -28 - 14

-6x < - 42 -------------------- (Divide both sides by -6)

Note: If you decide an inequality expression by a negative value, the inequality sign changes)

-6x/-6 > -42/-6

x > 7

Solving the 2nd inequality

9x + 15 ≤ −12 ----------- (Collect like terms)

9x ≤ −12 - 15

9x ≤ −27 ------------------(Divide both sides by 9)

9

9x/9 ≤ −27/9

x ≤ -3

Bring both results together, we get

x>7 or x ≤ -3

The final result is complex (i.e. can't be combined together).

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The question is kind of all over the place. Can you clear it up a bit because it sound to me that all you have to do is simple addition and subtraction hun.
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