Respuesta :

Answer:

10a = 30

Step-by-step explanation:

By using elimination:

4a + 2z = 10

-2(3a + z) = -2(-10)

4a + 2z = 10

6a - 2z = 20

2z and -2z cancel out

10a = 30

a = 3

They are asking for 10a, so 10 (3) = 30.

XaniHan
4a + 2z = 10
2z = -4a + 10

Replace z by -4a + 10 in the second equation

-3a + z = -10
-3a + (-4a + 10) = -10
-7a +10 = -10
-7a = -20
a = 7/20

Value of 10a
10a
= 10(7/20)
= 3.5 or 7/2