HELP ME PLEASE MY LAST DAY TO TURN THIS IN! MARKING BRAINLIESTSolving Systems of Equations by Elimination3) 7x + 3y= 22 4y= 20 4) -2x + y= 10 4x - y= -14

Answer: 3) [tex]x=1\\ y=5[/tex] 4) [tex]x=-2\\ y=6[/tex] 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 [tex]y[/tex] in the second one and substitute its value into the first equation to calculate [tex]x[/tex]: [tex]\left \{ {{7x + 3y= 22} \atop {4y=20}} \right. \\[/tex] [tex]y=\frac{20}{4} \\ y=5[/tex] [tex]7x + 3(5)= 22\\ 7x=7\\x=1[/tex] 4) You must add both equations to cancel the variable [tex]y[/tex] and solve for [tex]x[/tex]. Then, susbstiute the value of this variable into one of the original equations to calculate [tex]y[/tex]: [tex]\left \{ {{-2x+y=10} \atop {4x-y=-14}} \right.[/tex] [tex]2x=-4\\ x=-2[/tex] [tex]-2(-2)+y=10\\ y=6[/tex]