Which expression has a negative value? a) b)−1×2×−3×4×−5 c)1×−2×−3×−4×−5 d)1×−2×3×−4×5

B

Step-by-step explanation:

B) -1*2*-3*4*-5=-2*-3*4*-5=6*4*-5=24*-5=-120

C) 1*-2*-3*-4*-5=-2*-3*-4*-5=6*-4*-5=-24*-5=120

D) 1*-2*3*-4*5=-2*3*-4*5=-6*-4*5=24*5=120

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.