Respuesta :

semsee45

Answer:

a=5,  b=6

Step-by-step explanation:

Substitute  b = 2a - 4  into  5a - 3b = 7:

5a - 3(2a - 4) = 7

5a - 6a + 12 = 7

a = 5

Now use the found value of a to find b by using  b = 2a - 4:

b = 2(5) - 4 = 10 - 4 = 6