Please jawab no 2 agar dapat 14 point

-2a + b = -4
-6a + b = 12
eliminasi

4a = -16
a = -4

-2a + b = -4
-2(-4)+b = -4
8 + b = -4
b = -12

R(x) = -4x + (-12)

R(25) = -4(25) + (-12)
= (-100) + (-12)
=(-112)

semoga membantu