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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