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Rainbow [258]
3 years ago
7

HELP ME PLEASE MY LAST DAY TO TURN THIS IN! MARKING BRAINLIEST

Mathematics
1 answer:
Nitella [24]3 years ago
3 0

Answer:

3) x=1\\ y=5

4) x=-2\\ y=6

Step-by-step explanation:

3) For this system of equation you already has one variable in the second equation. Therefore, you only need to solve for y in the second one and substitute its value into the first equation to calculate x:

\left \{ {{7x + 3y= 22} \atop {4y=20}} \right. \\

y=\frac{20}{4} \\ y=5

7x + 3(5)= 22\\ 7x=7\\x=1

4) You must add both equations to cancel the variable y and solve for x. Then, susbstiute the value of this variable into one of the original equations to calculate y:

\left \{ {{-2x+y=10} \atop {4x-y=-14}} \right.

2x=-4\\ x=-2

-2(-2)+y=10\\ y=6


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