Question

$\left \{ {{7x + 2y = 58} \atop {3y = 45}} \right.$ por favor é urgenteeeeeeeeeee!!!!!!!

Answer 1

$3y = 45 \\ y = \frac{45}{3} \\ y = 15 \\ 7x + 2y = 58 \\ 7x + 2 \times 15 = 58 \\ 7x + 30 = 58 \\ 7x = 58 - 30 \\ 7x = 28 \\ x = \frac{28}{7} \\ x = 4$
Logo, o par ordenado que resolve o sistema é (4;15).

Answer 2

7x+2y= 58
3y= 45

3y= 45
y= 45/3
y= 15

7x+2y=58
7x+2.15= 58
7x+30=58
7x=58-30
7x=28
x=28/7
x=4

R.: x= 4; y =15