A triangular pyramid has a base shaped like an equilateral triangle. The legs of the equilateral triangle are all 13 feet long, and the height of the equilateral triangle is 11.3 feet. The pyramid's slant height is 11 feet. What is its surface area?
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Answer multiply the width and the height

Step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

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