Question

b) 28+7yx +5ry + 6xy - 10, when x = 1 and y = -1​

Answer 1

Answer:

-5r+7

Step-by-step explanation:

28+7yx+5ry+6xy-10[x=1,y=-1]

28+7(-1×1)+5(r×-1)+6(1×-1)-10

28+(-7)+(-5r)+(-6)-10

28-7-5r-6-10

21-5r-4

-5r-4+21

= -5r+7

i hope it is correct and help you