Y=2(a+b) z=3 a+5

To find the expressions for y and z in terms of a and b, we can substitute the given expressions for a and b into the equations.

Given: y = 2(a + b) and z = 3a + 5

Substitute z's expression into y: y = 2(a + b) y = 2(a + b) y = 2a + 2b

Now, substitute the given expression for a into z: z = 3a + 5 z = 3(a + 5) z = 3a + 15

Therefore, the expressions for y and z in terms of a and b are: y = 2a + 2b z = 3a + 15